Other Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other liabilities
Employee compensation and benefits	$ 18,356	$ 16,808
Liability for pension benefits	232,788	221,965
Liabilities for uncertain tax positions	2,416	3,492
Other	20,393	25,302
Other liabilities (less current portion)	$ 273,953	$ 267,567