Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Cost	$ 2,385,162		$ 2,385,162		$ 2,374,407
Accumulated depreciation	(1,545,732)		(1,545,732)		(1,520,138)
Total	839,430		839,430		854,269
Depreciation expense	42,786	$ 38,191	132,316	$ 116,807
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	55,278		55,278		55,567
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	553,665		553,665		546,809
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 1,776,219		$ 1,776,219		$ 1,772,031