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v3.19.3.a.u2

Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Balance | $ 1,809,177 |  |
Balance | 1,440,142 | $ 1,809,177 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Balance | (45,449) | (42,718) | $ (45,413)
Other comprehensive loss before reclassifications | 2,026 | (4,254) | 1,577
Amounts reclassified from AOCI | 1,323 | 1,523 | 1,118
Balance | (42,100) | (45,449) | (42,718)
Defined Benefit Pension Plan [Member] |  |  |
Balance | (38,670) | (39,441) | (40,865)
Other comprehensive loss before reclassifications | (539) | (695) | 306
Amounts reclassified from AOCI | 1,383 | 1,466 | 1,118
Balance | (37,826) | (38,670) | (39,441)
Foreign Currency Translation [Member] |  |  |
Balance | (6,315) | (3,591) | (4,864)
Other comprehensive loss before reclassifications | 944 | (2,724) | 1,273
Balance | (5,371) | (6,315) | (3,591)
Unrealized Gain (Loss) In Fair Value Of Investments [Member] |  |  |
Balance | (464) | 314 | 316
Other comprehensive loss before reclassifications | 1,621 | (835) | (2)
Amounts reclassified from AOCI | (60) | 57 |
Balance | $ 1,097 | $ (464) | $ 314

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