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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Intangible assets      
Contract intangibles $ 89,420 $ 180,233  
Less accumulated amortization (14,258) (18,302)  
Net book value 75,164 161,931  
Total amortization expense on intangible assets 9,298 10,150 3,423
Estimated amortization expense      
For year ended December 31, 2012 3,766    
For year ended December 31, 2013 4,664    
For year ended December 31, 2014 4,500    
For year ended December 31, 2015 4,500    
For year ended December 31, 2016 $ 4,500