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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]      
Foreign currency translation, Beginning balance $ (67,895) $ (70,296)  
Foreign currency translation, Other comprehensive income (loss) before reclassifications 15,473 2,401  
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 15,473 2,401  
Reclassification of foreign currency translation associated with noncontrolling interest acquired (16,995)    
Foreign currency translation, Ending balance (69,417) (67,895) $ (70,296)
Unrealized gain (loss) on hedging activities, Beginning balance (18) 390  
Unrealized gain (loss) on derivatives, Other comprehensive income (loss) before reclassifications 509 (572)  
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (634) 164  
Unrealized gain (loss) on derivatives, Net other comprehensive loss, net of tax (125) (408) 389
Unrealized gain (loss) on hedging activities, Ending balance (143) (18) 390
Benefit plan liability, Beginning balance   84  
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss   (84)  
Benefit plan liability, Other comprehensive income (loss)   (84) (45)
Benefit plan liability, Ending balance     84
Accumulated other comprehensive income (loss), Beginning balance (67,913) (69,822)  
Total, Other comprehensive loss before reclassifications 15,982 1,829  
Total, Amounts reclassified from accumulated other comprehensive loss (634) 80  
Total, Net other comprehensive loss, net of tax 15,348 1,909  
Accumulated other comprehensive income (loss), Ending balance $ (69,560) $ (67,913) $ (69,822)