Fixed Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant and Equipment Gross
Land	$ 9,908,000	$ 6,797,000
Buildings	213,196,000	176,200,000
Machinery and equipment	923,374,000	918,075,000
Property, Plant and Equipment, Gross	1,146,478,000	1,101,072,000
Accumulated depreciation	(861,387,000)	(855,901,000)
Property, plant and equipment, net	285,091,000	245,171,000
Rental Property And Equipment
Rental property and equipment	462,244,000	537,128,000
Accumulated depreciation	(261,864,000)	(310,982,000)
Rental property and equipment, net	200,380,000	226,146,000
Depreciation expense	$ 165,000,000	$ 158,000,000	$ 177,000,000