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Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other liabilities    
Employee compensation and benefits $ 19,010 $ 18,356
Liability for pension benefits 217,390 232,788
Liabilities for uncertain tax positions 808 2,416
Other 14,682 20,393
Other liabilities (less current portion) $ 251,890 $ 273,953