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Shareholders' Equity - Components Of Accumulated OCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative foreign currency translation adjustment $ (67,053) $ (69,855)
Net unrealized loss on hedges, net of tax (2,754) (4,109)
Accumulated OCI (69,807) (73,964)
Deferred tax assets $ 700 $ 1,000