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Summary of Significant Accounting Policies (Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Balance | $ 1,365,505 | $ 1,247,535 | $ 1,143,864
Other comprehensive (loss) income | (547) | (8,239) | 10,195
Balance | 1,420,227 | 1,365,505 | 1,247,535
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |
Balance | (41,618) | (33,379) | (43,574)
Other comprehensive (loss) income | (547) | (8,239) | 10,195
Balance | (42,165) | (41,618) | (33,379)
Defined Benefit Pension Plan [Member] |  |  |
Balance | (40,268) | (32,113) | (43,023)
Other comprehensive (loss) income | 2,026 | (8,155) | 10,910
Balance | (38,242) | (40,268) | (32,113)
Foreign Currency Translation [Member] |  |  |
Balance | (1,389) | (751) | (13)
Other comprehensive (loss) income | (3,214) | (638) | (738)
Balance | (4,603) | (1,389) | (751)
Unrealized Gain (Loss) In Fair Value Of Investments [Member] |  |  |
Balance | (110) | (315) | 240
Other comprehensive (loss) income | 766 | 205 | (555)
Balance | 656 | (110) | (315)
Unrealized Gain (Loss) In Fair Value Of Interest Rate Swap [Member] |  |  |
Balance | 149 | (200) | (778)
Other comprehensive (loss) income | (125) | 349 | 578
Balance | $ 24 | $ 149 | $ (200)

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