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Fair Values of Assets and Liabilities Reconciliation of Level 3 Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Level 3 assets measured at fair value on a recurring basis using significant unobservable inputs [Abstract]    
Beginning Balance $ 15,648 $ 26,706
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description 3,456 1,587
Settlements (8,049) (12,335)
Impact of foreign currency translation 54 (310)
Ending Balance $ 11,109 $ 15,648