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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
General corporate expenses and other business operations, net        
Gross profit-Other $ 65,735 $ 72,086 $ 110,179 $ 125,940
Selling, general and administrative:        
Total selling, general and administrative (22,886) (22,517) (44,277) (43,102)
Other income 112 1,105 348 1,977
Other expense (555) (2,321) (722) (2,383)
Total general corporate expenses and other business operations, net 42,323 48,274 65,405 82,311
Other [Member]
        
General corporate expenses and other business operations, net        
Gross profit-Other 1,246 1,047 2,246 1,947
Selling, general and administrative:        
Personnel costs (3,448) (2,541) (5,530) (4,151)
Professional fees (965) (947) (2,369) (2,089)
All other (979) (817) (1,782) (2,511)
Total selling, general and administrative (5,392) (4,305) (9,681) (8,751)
Other income 9 29 195 76
Other expense 0 (395) 0 (398)
Total general corporate expenses and other business operations, net $ (4,137) $ (3,624) $ (7,240) $ (7,126)