Shareholders' Equity - Components Of Accumulated OCI (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative foreign currency translation adjustment	$ (64,048)	$ (78,953)
Unrealized loss on hedges, net	(8,314)	(18,021)
Accumulated other comprehensive loss	(72,362)	(96,974)
Deferred income taxes	$ 4,500	$ 9,700