Operating Property And Equipment (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Minimum [Member] Land [Member]	Dec. 31, 2012 Minimum [Member] Buildings and improvements [Member]	Dec. 31, 2012 Minimum [Member] Machinery and equipment [Member]	Dec. 31, 2012 Minimum [Member] Other [Member]	Dec. 31, 2012 Maximum [Member] Land [Member]	Dec. 31, 2012 Maximum [Member] Buildings and improvements [Member]	Dec. 31, 2012 Maximum [Member] Machinery and equipment [Member]	Dec. 31, 2012 Maximum [Member] Other [Member]
Property, Plant and Equipment [Line Items]
Minimum estimated useful lives			0 years	10 years	3 years	3 years	0 years	40 years	10 years	10 years
Operating Property and Equipment
Land	$ 190,357	$ 188,617
Buildings and improvements	716,743	699,809
Machinery and equipment	578,718	535,183
Other	105,255	112,288
Gross	1,591,073	1,535,897
Accumulated depreciation	(966,220)	(911,717)
Total	$ 624,853	$ 624,180