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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | $ 1,654,921 |  |
Balance at the beginning of the period, noncontrolling interests | 18,799 |  |
Other comprehensive income (loss) before reclassifications | (5,357) | $ 1,330 | $ (6,124)
Amounts reclassified from AOCI | 1,955 | 1,776 | 1,483
Other comprehensive income | (2,272) | 140 | 230
Balance at the end of the period | 1,449,718 | 1,654,921 |
Balance at the end of the period, noncontrolling interests | (7,734) | 18,799 |
AOCI Attributable to Parent |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (43,635) | (46,741) | (42,100)
Balance at the end of the period | (47,037) | (43,635) | (46,741)
Defined Benefit Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (37,866) | (44,087) | (37,826)
Other comprehensive income (loss) before reclassifications | 3,370 | 4,167 | (7,993)
Amounts reclassified from AOCI | 1,859 | 2,054 | 1,732
Balance at the end of the period | (32,637) | (37,866) | (44,087)
Foreign Currency Translation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | (5,787) | (5,322) | (5,371)
Other comprehensive income (loss) before reclassifications | (1,454) | (465) | 49
Amounts reclassified from AOCI | 0 | 0 | 0
Balance at the end of the period | (7,241) | (5,787) | (5,322)
Unrealized Gain (Loss) in Fair Value of Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period | 18 | 2,668 | 1,097
Other comprehensive income (loss) before reclassifications | (7,273) | (2,372) | 1,820
Amounts reclassified from AOCI | 96 | (278) | (249)
Balance at the end of the period | (7,159) | 18 | 2,668
AOCI Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period, noncontrolling interests | 542 | 402 | 172
Balance at the end of the period, noncontrolling interests | (1,730) | 542 | 402
Defined Benefit Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period, noncontrolling interests | 0 | 0 | 0
Other comprehensive income | 0 | 0 | 0
Balance at the end of the period, noncontrolling interests | 0 | 0 | 0
Foreign Currency Translation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period, noncontrolling interests | 542 | 402 | 172
Other comprehensive income | (1,341) | 140 | 230
Balance at the end of the period, noncontrolling interests | (799) | 542 | 402
Unrealized Loss in Fair Value of Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at the beginning of the period, noncontrolling interests | 0 | 0 | 0
Other comprehensive income | (931) | 0 | 0
Balance at the end of the period, noncontrolling interests | $ (931) | $ 0 | $ 0

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