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Summary Of Significant Accounting Policies - Foreign Currency (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Foreign currency translation losses included in Accumulated OCI $ 35,943 $ 12,849 $ 19,464
Foreign currency transaction gains (losses) $ 200 $ (1,200) $ 2,500