Operating Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land	$ 203,543	$ 201,089
Buildings and improvements	776,304	766,360
Machinery and equipment	709,173	663,616
Other	109,554	103,557
Gross	1,798,574	1,734,622
Accumulated depreciation	(1,083,604)	(1,035,028)
Total	714,970	699,594
Operating equipment depreciation expense	$ 84,000	$ 79,000	$ 73,000
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