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Employee Benefit Plans - Changes in Fair Value Measurements of Pension Plan Assets Using Significant Unobservable Inputs (Details) - European Plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Delta Lloyd fixed income    
Changes in fair value measurements using significant unobservable inputs    
Fair value of plan assets at beginning of year $ 1,864 $ 3,481
Sales/Maturities (668) (1,394)
Foreign currency translation (38) (223)
Fair value of plan assets at end of year 1,158 1,864
Insurance reserves    
Changes in fair value measurements using significant unobservable inputs    
Fair value of plan assets at beginning of year 1,259 1,299
Purchases 101 139
Sales/Maturities (525) (50)
Foreign currency translation (27) (129)
Fair value of plan assets at end of year $ 808 $ 1,259