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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Beginning balance | $ 1,440,142 |  |
Ending balance | 1,553,856 | $ 1,440,142 |
Accumulated Other Comprehensive Loss |  |  |
Beginning balance | (42,100) | (45,449) | $ (42,718)
Other comprehensive loss before reclassifications | (6,124) | 2,026 | (4,254)
Amounts reclassified from AOCI | 1,483 | 1,323 | 1,523
Ending balance | (46,741) | (42,100) | (45,449)
Defined Benefit Pension Plan |  |  |
Beginning balance | (37,826) | (38,670) | (39,441)
Other comprehensive loss before reclassifications | (7,993) | (539) | (695)
Amounts reclassified from AOCI | 1,732 | 1,383 | 1,466
Ending balance | (44,087) | (37,826) | (38,670)
Foreign Currency Translation |  |  |
Beginning balance | (5,371) | (6,315) | (3,591)
Other comprehensive loss before reclassifications | 49 | 944 | (2,724)
Amounts reclassified from AOCI | 0 | 0 | 0
Ending balance | (5,322) | (5,371) | (6,315)
Unrealized Gain (Loss) in Fair Value of Investments |  |  |
Beginning balance | 1,097 | (464) | 314
Other comprehensive loss before reclassifications | 1,820 | 1,621 | (835)
Amounts reclassified from AOCI | (249) | (60) | 57
Ending balance | $ 2,668 | $ 1,097 | $ (464)

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