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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
General corporate expenses and other business operations, net    
Gross profit-Other $ 44,444 $ 53,854
Selling, general and administrative:    
Total selling, general and administrative (21,391) (20,585)
Other income 236 872
Other expense (167) (62)
Operating income 23,082 34,037
Other [Member]
    
General corporate expenses and other business operations, net    
Gross profit-Other 1,000 900
Selling, general and administrative:    
Personnel costs (2,082) (1,610)
Professional fees (1,404) (1,142)
All other (803) (1,694)
Total selling, general and administrative (4,289) (4,446)
Other income 186 47
Other expense   (3)
Operating income $ (3,103) $ (3,502)