| | 2019-12-31 | 2020-12-31 | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 | 2025-06-30 |
| Asset Impairment Charge | | | | 0.0 | 0.0 | 40988000.0 | |
| Beginning Cash Position | | | 424533000.0 | 618980000.0 | 17438000.0 | 268047000.0 | 101901000.0 |
| Capital Expenditure | | | -428714000.0 | -449431000.0 | -410934000.0 | -393735000.0 | -378472000.0 |
| Capital Expenditure Reported | | | -428714000.0 | -449431000.0 | -410934000.0 | -393735000.0 | -378472000.0 |
| Cash Dividends Paid | | | -343039000.0 | -396822000.0 | -434875000.0 | -450965000.0 | -456506000.0 |
| Cash Flow From Continuing Financing Activities | | | 421371000.0 | 109930000.0 | -417214000.0 | -725485000.0 | -191944000.0 |
| Cash Flow From Continuing Investing Activities | | | -804391000.0 | -1456184000.0 | -127127000.0 | -285230000.0 | -658209000.0 |
| Cash Flow From Continuing Operating Activities | | | 577467000.0 | 744712000.0 | 794950000.0 | 774877000.0 | 792797000.0 |
| Change In Account Payable | | | 14786000.0 | -2990000.0 | 13639000.0 | -3336000.0 | -7785000.0 |
| Change In Income Tax Payable | | | -809000.0 | 22901000.0 | 968000.0 | -17776000.0 | 789000.0 |
| Change In Other Current Assets | | | -12068000.0 | -13950000.0 | -1951000.0 | -8731000.0 | -1766000.0 |
| Change In Other Current Liabilities | | | -2133000.0 | -6207000.0 | 2018000.0 | 34717000.0 | 30758000.0 |
| Change In Other Working Capital | | | 3742000.0 | 4159000.0 | 3301000.0 | 3880000.0 | 4394000.0 |
| Change In Payable | | | 13977000.0 | 19911000.0 | 14607000.0 | -21112000.0 | -6996000.0 |
| Change In Payables And Accrued Expense | | | 13977000.0 | 19911000.0 | 14607000.0 | -21112000.0 | -6996000.0 |
| Change In Tax Payable | | | -809000.0 | 22901000.0 | 968000.0 | -17776000.0 | 789000.0 |
| Change In Working Capital | | | 3518000.0 | 3913000.0 | 17975000.0 | 8754000.0 | 26390000.0 |
| Changes In Cash | | | 194447000.0 | -601542000.0 | 250609000.0 | -235838000.0 | -57356000.0 |
| Common Stock Dividend Paid | | | -343039000.0 | -396822000.0 | -434875000.0 | -450965000.0 | -456506000.0 |
| Common Stock Issuance | | | 759209000.0 | 516758000.0 | 0.0 | 0.0 | |
| Common Stock Payments | | 0.0 | | 0.0 | 0.0 | -49997000.0 | 0.0 |
| Depreciation Amortization Depletion | | | 420692000.0 | 577020000.0 | 574813000.0 | 582014000.0 | 592678000.0 |
| Depreciation And Amortization | | | 420692000.0 | 577020000.0 | 574813000.0 | 582014000.0 | 592678000.0 |
| Dividend Received CFO | | | 9645000.0 | 3015000.0 | 0.0 | 0.0 | |
| Earnings Losses From Equity Investments | | | -9777000.0 | -3048000.0 | 0.0 | 0.0 | |
| End Cash Position | | | 618980000.0 | 17438000.0 | 268047000.0 | 32209000.0 | 44545000.0 |
| Financing Cash Flow | | | 421371000.0 | 109930000.0 | -417214000.0 | -725485000.0 | -191944000.0 |
| Free Cash Flow | | | 148753000.0 | 295281000.0 | 384016000.0 | 381142000.0 | 414325000.0 |
| Gain Loss On Investment Securities | | | -174384000.0 | -36372000.0 | -225416000.0 | -43806000.0 | -47293000.0 |
| Income Tax Paid Supplemental Data | | | 2181000.0 | 3216000.0 | 3591000.0 | 2816000.0 | 2441000.0 |
| Interest Paid Supplemental Data | | | 97301000.0 | 111069000.0 | 128870000.0 | 129637000.0 | 138181000.0 |
| Investing Cash Flow | | | -804391000.0 | -1456184000.0 | -127127000.0 | -285230000.0 | -658209000.0 |
| Issuance Of Capital Stock | | | 759209000.0 | 516758000.0 | 0.0 | 0.0 | |
| Issuance Of Debt | | | 0.0 | 1058000000.0 | 1833235000.0 | 981952000.0 | 1568821000.0 |
| Long Term Debt Issuance | | | 0.0 | 1058000000.0 | 1833235000.0 | 981952000.0 | 1054000000.0 |
| Long Term Debt Payments | | | 0.0 | -1066000000.0 | -1814749000.0 | -1208000000.0 | -1304000000.0 |
| Net Common Stock Issuance | | | 759209000.0 | 516758000.0 | 0.0 | -49997000.0 | 0.0 |
| Net Income From Continuing Operations | | | 312376000.0 | 661508000.0 | 410553000.0 | 170840000.0 | 163632000.0 |
| Net Investment Properties Purchase And Sale | | | -375242000.0 | -995515000.0 | 290663000.0 | 114474000.0 | -275441000.0 |
| Net Investment Purchase And Sale | 0.0 | | | | | | |
| Net Issuance Payments Of Debt | | | 0.0 | -8000000.0 | 18486000.0 | -226048000.0 | 264821000.0 |
| Net Long Term Debt Issuance | | | 0.0 | -8000000.0 | 18486000.0 | -226048000.0 | -250000000.0 |
| Net Other Financing Charges | | | 5201000.0 | -2006000.0 | -825000.0 | 1525000.0 | -259000.0 |
| Net Other Investing Changes | | | -435000.0 | -11238000.0 | -6856000.0 | -5969000.0 | -4296000.0 |
| Net Short Term Debt Issuance | 44000000.0 | -44000000.0 | 0.0 | | | | |
| Operating Cash Flow | | | 577467000.0 | 744712000.0 | 794950000.0 | 774877000.0 | 792797000.0 |
| Operating Gains Losses | | | -184161000.0 | -39420000.0 | -222903000.0 | -42885000.0 | -47293000.0 |
| Other Non Cash Items | | | | -474146000.0 | | | |
| Purchase Of Investment Properties | | | -629959000.0 | -1066051000.0 | 0.0 | 0.0 | -334216000.0 |
| Repayment Of Debt | | | 0.0 | -1066000000.0 | -1814749000.0 | -1208000000.0 | -1304000000.0 |
| Repurchase Of Capital Stock | | 0.0 | | 0.0 | 0.0 | -49997000.0 | 0.0 |
| Sale Of Investment | 0.0 | | | | | | |
| Sale Of Investment Properties | | | 254717000.0 | 70536000.0 | 290663000.0 | 114474000.0 | 58775000.0 |
| Short Term Debt Issuance | 1217000000.0 | 358000000.0 | 0.0 | | | | |
| Short Term Debt Payments | -1173000000.0 | -402000000.0 | 0.0 | | | | |
| Stock Based Compensation | | | 15397000.0 | 12822000.0 | 14512000.0 | 15166000.0 | 16402000.0 |