Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Noncurrent Liabilities [Abstract]
Pension liabilities	$ 36,782	$ 37,867
Postretirement benefits other than pensions	55,310	60,237
Interest rate swap agreement	2,400	1,411
Incentive and deferred compensation	3,421	$ 2,730
Restructuring	3,320
Other	311	$ 834
Total	$ 101,544	$ 103,079