Operating Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	$ 212,660	$ 203,543
Buildings and improvements	808,909	776,304
Machinery and equipment	737,899	709,173
Other	114,442	109,554
Gross	1,873,910	1,798,574
Accumulated depreciation	(1,128,040)	(1,083,604)
Total	745,870	714,970
Operating equipment depreciation expense	$ 88,000	$ 84,000	$ 79,000
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Minimum | Other
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years