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Summary of Significant Accounting Policies (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]      
Foreign currency translation, Beginning balance $ (45,603) $ (30,335)  
Foreign currency translation, Other comprehensive income (loss) before reclassifications (24,693) (18,002)  
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss   (2,734)  
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax (24,693) (15,268)  
Foreign currency translation, Ending balance (70,296) (45,603) $ (30,335)
Unrealized gain (loss) on hedging activities, Beginning balance 1 (111)  
Unrealized gain (loss) on derivatives, Other comprehensive income (loss) before reclassifications (671) (454)  
Unrealized gain (loss) on derivatives, Amounts reclassified from accumulated other comprehensive loss (1,060) (566)  
Unrealized gain (loss) on derivatives, Net other comprehensive loss, net of tax 389 112 (2,251)
Unrealized gain (loss) on hedging activities, Ending balance 390 1 (111)
Benefit plan liability, Beginning balance 129 (12)  
Benefit plan liability, Other comprehensive loss before reclassifications (45)    
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss   141  
Benefit plan liability, Other comprehensive income (loss) (45) 141  
Benefit plan liability, Ending balance 84 129 (12)
Accumulated other comprehensive income (loss), Beginning balance (45,473) (30,458)  
Total, Other comprehensive loss before reclassifications (25,409) (18,456)  
Total, Amounts reclassified from accumulated other comprehensive loss 1,060 3,441  
Total, Net other comprehensive loss, net of tax (24,349) (15,015)  
Accumulated other comprehensive income (loss), Ending balance $ (69,822) $ (45,473) $ (30,458)