Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation	$ 175,495	$ 167,516	$ 152,079
Cost	2,468,930	2,374,407
Accumulated depreciation	(1,523,260)	(1,520,138)
Total	945,670	854,269
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	68,575	55,567
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	597,523	546,809
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 1,802,832	$ 1,772,031