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Employee Retirement Plans - Schedule of Change in Value of Assets of Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning balance $ 172,511 $ 181,877
Actual return on plan assets 34,354 4,619
Benefits paid (5,564) (7,499)
Contributions 1,376 11,136
Foreign currency gain (loss) (31,905) (17,622)
Ending balance 170,772 $ 172,511
Unfunded status at end of year $ 21,827