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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Pension liabilities $ 39,473 $ 35,921
Postretirement benefits other than pensions 54,423 53,293
Obligations under license agreement 897 10,254
Incentive and deferred compensation 3,048 3,468
Restructuring 600 908
Other 3,114 2,983
Total $ 101,555 $ 106,827