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Other Liabilities - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Other liabilities    
Employee compensation and benefits $ 18,138 $ 16,808
Liability for pension benefits 225,297 221,965
Liabilities for uncertain tax positions 3,437 3,492
Other 20,332 25,302
Other liabilities (less current portion) $ 267,204 $ 267,567