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Stockholders' Equity (Comprehensive Income) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 1,706,909  
Ending Balance 1,914,426  
Change in Unrealized Gain (Loss) on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 3,619 $ 888
Other comprehensive (loss) income before reclassifications, before tax (10,124) (5,970)
Tax benefit 2,784 1,792
Other comprehensive (loss) income before reclassifications, net of tax (7,340) (4,178)
Reclassification of loss from accumulated other comprehensive income, before tax 4,201 746
Tax benefit (1,028) (279)
Reclassification of loss from accumulated other comprehensive income, after tax 3,173 467
Net current-period other comprehensive (loss) income, net of tax (4,167) (3,711)
Ending Balance (548) (2,823)
Foreign Currency Translation Adjustments Gain (Loss)    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (72,106) (55,116)
Other comprehensive (loss) income before reclassifications, before tax 111,123 32,598
Tax benefit 0 0
Other comprehensive (loss) income before reclassifications, net of tax 111,123 32,598
Reclassification of loss from accumulated other comprehensive income, before tax 0 0
Tax benefit 0 0
Reclassification of loss from accumulated other comprehensive income, after tax 0 0
Net current-period other comprehensive (loss) income, net of tax 111,123 32,598
Ending Balance 39,017 (22,518)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (68,487) (54,228)
Other comprehensive (loss) income before reclassifications, before tax 100,999 26,628
Tax benefit 2,784 1,792
Other comprehensive (loss) income before reclassifications, net of tax 103,783 28,420
Reclassification of loss from accumulated other comprehensive income, before tax 4,201 746
Tax benefit (1,028) (279)
Reclassification of loss from accumulated other comprehensive income, after tax 3,173 467
Net current-period other comprehensive (loss) income, net of tax 106,956 28,887
Ending Balance $ 38,469 $ (25,341)