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Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property Plant and Equipment Gross      
Land $ 9,908 $ 9,908  
Buildings 185,431 218,261  
Machinery and equipment 802,992 984,634  
Property, Plant and Equipment, Gross 998,331 1,212,803  
Accumulated depreciation (683,728) (882,715)  
Property, plant and equipment, net 314,603 330,088  
Rental Property And Equipment      
Rental property and equipment 400,913 404,348  
Accumulated depreciation (212,859) (226,833)  
Rental property and equipment, net 188,054 177,515  
Depreciation expense 138,000 $ 136,000 $ 165,000
Capitalized software $ 192,000