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Summary of Significant Accounting Policies (Tax Effects of Componenets of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract] |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ (4,452) | $ 31 | $ (13,887)
Defined benefit pension plan adjustments, Tax (Expense) Benefit | 1,829 | 1,995 | 5,732
Defined benefit pension plan adjustments, Net-of-Tax Amount | (2,623) | 2,026 | (8,155)
Foreign currency translation adjustment, Before-Tax Amount | (439) | (5,897) | (1,086)
Foreign currency translation adjustment, Tax (Expense) Benefit | 178 | 2,683 | 448
Foreign currency translation adjustment, Net-of-Tax Amount | (261) | (3,214) | (638)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount | (576) | 1,123 | 346
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit | 236 | (357) | (141)
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount | (340) | 766 | 205
Unrealized gain (loss) in fair value of interest rate swap, Before-Tax Amount | (45) | (37) | 594
Unrealized gain (loss) in fair value of interest rate swap, Tax (Expense) Benefit | 21 | (88) | (245)
Unrealized gain (loss) in fair value of interest rate swap, Net-of-Tax Amount | (24) | (125) | 349
Total other comprehensive (loss) income, Before-Tax Amount | (5,512) | (4,780) | (14,033)
Total other comprehensive (loss) income, Tax (Expense) Benefit | 2,264 | 4,233 | 5,794
Total other comprehensive loss, net of tax | $ (3,248) | $ (547) | $ (8,239)

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