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Employee Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]        
Service cost - benefits earning during the period $ 0 $ 0 $ 0 $ 0
Interest cost on projected benefit obligation 1,344 1,403 4,033 4,209
Expected return on assets (1,901) (1,921) (5,702) (5,764)
Actuarial gain 0 0 0 0
Foreign currency gain (loss) (24) 7 (72) 22
Net periodic benefit cost (income) $ (581) $ (511) $ (1,741) $ (1,533)