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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Equity [Abstract]        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ (19,081) $ (54,457) $ (26,248)  
Changes in the balances of each component of accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Foreign Currency Translation, Net of Tax, Beginning Balance (118,532) (64,075) (37,827)  
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Foreign Currency Translation, Net of Tax, Ending Balance (137,613) (118,532) (64,075)  
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps, Net of Tax, Beginning Balance (19,452) (17,909) (13,850)  
Interest rate swap contracts 10,121 (1,543) (4,059)  
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps, Net of Tax, Ending Balance (9,331) (19,452) (17,909)  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (137,984) (81,984) (51,677)  
Other comprehensive income, net of tax (8,960) (56,000) (30,307)  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (137,984) $ (81,984) $ (51,677) $ (146,944)