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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract] |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 31 | $ (13,887) | $ 18,675
Defined benefit pension plan adjustments, Tax (Expense) Benefit | 1,995 | 5,732 | (7,765)
Defined benefit pension plan adjustments, Net-of-Tax Amount | 2,026 | (8,155) | 10,910
Foreign currency translation adjustment, Before-Tax Amount | (5,897) | (1,086) | (1,212)
Foreign currency translation adjustment, Tax (Expense) Benefit | 2,683 | 448 | 474
Foreign currency translation adjustment, Net-of-Tax Amount | (3,214) | (638) | (738)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount | 1,123 | 346 | (744)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit | (357) | (141) | 189
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount | 766 | 205 | (555)
Unrealized gain (loss) in fair value of interest rate swap, Before-Tax Amount | (37) | 594 | 948
Unrealized gain (loss) in fair value of interest rate swap, Tax (Expense) Benefit | (88) | (245) | (370)
Unrealized gain (loss) in fair value of interest rate swap, Net-of-Tax Amount | (125) | 349 | 578
Total other comprehensive (loss) income, Before-Tax Amount | (4,780) | (14,033) | 17,667
Total other comprehensive (loss) income, Tax (Expense) Benefit | 4,233 | 5,794 | (7,472)
Total other comprehensive (loss) income, net of tax | $ (547) | $ (8,239) | $ 10,195

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