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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance | $ 1,713,275 |  |
Balance | 1,809,177 | $ 1,713,275 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Balance | (42,718) | (45,413) | $ (42,165)
Other comprehensive loss before reclassifications | (4,254) | 1,577 | (4,347)
Amounts reclassified from AOCI | 1,523 | 1,118 | 1,099
Balance | (45,449) | (42,718) | (45,413)
Defined Benefit Pension Plan [Member] |  |  |
Balance | (39,441) | (40,865) | (38,242)
Other comprehensive loss before reclassifications | (695) | 306 | (3,722)
Amounts reclassified from AOCI | 1,466 | 1,118 | 1,099
Balance | (38,670) | (39,441) | (40,865)
Foreign Currency Translation [Member] |  |  |
Balance | (3,591) | (4,864) | (4,603)
Other comprehensive loss before reclassifications | (2,724) | 1,273 | (261)
Balance | (6,315) | (3,591) | (4,864)
Unrealized (Loss) Gain In Fair Value Of Investments [Member] |  |  |
Balance | 314 | 316 | 656
Other comprehensive loss before reclassifications | (835) | (2) | (340)
Amounts reclassified from AOCI | 57 |  |
Balance | $ (464) | $ 314 | 316
Unrealized Gain (Loss) In Fair Value Of Interest Rate Swap [Member] |  |  |
Balance |  |  | 24
Other comprehensive loss before reclassifications |  |  | $ (24)

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