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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Beginning balance | $ 1,553,856 |  |
Ending balance | 1,654,921 | $ 1,553,856 |
Accumulated Other Comprehensive Loss |  |  |
Beginning balance | (46,741) | (42,100) | $ (45,449)
Other comprehensive income (loss) before reclassifications | 1,330 | (6,124) | 2,026
Amounts reclassified from AOCI | 1,776 | 1,483 | 1,323
Ending balance | (43,635) | (46,741) | (42,100)
Defined Benefit Pension Plan |  |  |
Beginning balance | (44,087) | (37,826) | (38,670)
Other comprehensive income (loss) before reclassifications | 4,167 | (7,993) | (539)
Amounts reclassified from AOCI | 2,054 | 1,732 | 1,383
Ending balance | (37,866) | (44,087) | (37,826)
Foreign Currency Translation |  |  |
Beginning balance | (5,322) | (5,371) | (6,315)
Other comprehensive income (loss) before reclassifications | (465) | 49 | 944
Amounts reclassified from AOCI | 0 | 0 | 0
Ending balance | (5,787) | (5,322) | (5,371)
Unrealized Gain (Loss) in Fair Value of Investments |  |  |
Beginning balance | 2,668 | 1,097 | (464)
Other comprehensive income (loss) before reclassifications | (2,372) | 1,820 | 1,621
Amounts reclassified from AOCI | (278) | (249) | (60)
Ending balance | $ 18 | $ 2,668 | $ 1,097

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