Fixed Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property Plant And Equipment Gross
Land	$ 23,852,000	$ 26,710,000
Machinery And Equipment Gross	1,278,332,000	1,352,295,000
Buildings and Improvements, Gross	335,625,000	361,463,000
Property Plant And Equipment Gross	1,637,809,000	1,740,468,000
Accumulated depreciation	(1,233,663,000)	(1,313,967,000)
Property, plant and equipment, net	404,146,000	426,501,000
Rental Property And Equipment
Rental property and equipment	649,343,000	710,374,000
Accumulated depreciation	(390,632,000)	(410,204,000)
Rental property and equipment, net	258,711,000	300,170,000
Depreciation expense	214,000,000	243,000,000	270,000,000
Pre-tax restructuring charge	$ 13,000,000	$ 10,000,000