Shareholders' Equity - Components Of Accumulated OCI (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative foreign currency translation adjustment	$ (69,561)	$ (78,953)
Unrealized loss on hedges, net	(12,002)	(18,021)
Accumulated other comprehensive loss	(81,563)	(96,974)
Deferred income taxes	$ 6,500	$ 9,700