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Employee Retirement Plans - Summary of Changes in Fair Value of Level 3 Pension Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]      
Beginning balance $ 172,511 $ 181,877  
Actual return on plan assets 34,354 4,619  
Contributions 8 32  
Benefits paid (5,564) (7,499)  
Foreign currency gain (loss) (31,905) (17,622)  
Ending balance 170,772 172,511 $ 181,877
Level 3      
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]      
Beginning balance 2,937 3,104  
Actual return on plan assets 972   3
Contributions 20   84
Benefits paid (150)   (109)
Foreign currency gain (loss) (575)   (145)
Ending balance $ 3,204 $ 2,937 $ 3,104