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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance | $ 1,553,023 |  |
Other comprehensive income (loss) | 2,695 | $ (3,248) | $ (547)
Balance | 1,713,275 | 1,553,023 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Balance | (45,413) | (42,165) | (41,618)
Other comprehensive income (loss) |  | (4,347) | (547)
Other comprehensive loss before reclassifications | 1,577 |  |
Amounts reclassified from AOCI | 1,118 | 1,099 |
Balance | (42,718) | (45,413) | (42,165)
Defined Benefit Pension Plan [Member] |  |  |
Balance | (40,865) | (38,242) | (40,268)
Other comprehensive income (loss) |  | (3,722) | 2,026
Other comprehensive loss before reclassifications | 306 |  |
Amounts reclassified from AOCI | 1,118 | 1,099 |
Balance | (39,441) | (40,865) | (38,242)
Foreign Currency Translation [Member] |  |  |
Balance | (4,864) | (4,603) | (1,389)
Other comprehensive income (loss) |  | (261) | (3,214)
Other comprehensive loss before reclassifications | 1,273 |  |
Balance | (3,591) | (4,864) | (4,603)
Unrealized (Loss) Gain In Fair Value Of Investments [Member] |  |  |
Balance | 316 | 656 | (110)
Other comprehensive income (loss) |  | (340) | 766
Other comprehensive loss before reclassifications | (2) |  |
Balance | $ 314 | 316 | 656
Unrealized Gain (Loss) In Fair Value Of Interest Rate Swap [Member] |  |  |
Balance |  | 24 | 149
Other comprehensive income (loss) |  | $ (24) | (125)
Balance |  |  | $ 24

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