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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
General corporate expenses and other business operations, net      
Gross profit-Other $ 223,018 $ 138,625 $ 137,414
Selling, general and administrative:      
Total selling, general and administrative 86,343 89,720 96,374
Other income 3,938 8,427 287
Other expense 3,823 1,262 527
Operating income 136,443 55,925 40,710
Other [Member]
      
General corporate expenses and other business operations, net      
Gross profit-Other 4,153 2,966 2,583
Selling, general and administrative:      
Personnel costs (8,418) (7,865) (8,083)
Professional fees (3,805) (3,784) (3,687)
All other (4,224) (3,040) (2,917)
Total selling, general and administrative (16,447) (14,689) (14,687)
Other income 118 366 192
Other expense (643) (4) (206)
Operating income $ (12,819) $ (11,361) $ (12,118)