Fixed Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 7,000,000	$ 13,000,000
Property Plant and Equipment Gross
Land	22,064,000	23,852,000
Buildings	349,061,000	335,625,000
Machinery and equipment	1,299,475,000	1,278,332,000
Property, Plant and Equipment, Gross	1,670,600,000	1,637,809,000
Accumulated depreciation	(1,285,223,000)	(1,233,663,000)
Property, plant and equipment, net	385,377,000	404,146,000
Rental Property And Equipment
Rental property and equipment	580,243,000	649,343,000
Accumulated depreciation	(339,051,000)	(390,632,000)
Rental property and equipment, net	241,192,000	258,711,000
Depreciation expense	$ 211,000,000	$ 214,000,000	$ 243,000,000