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Consolidated Statement of Comprehensive Income (Unaudited) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statement of Comprehensive Income    
Net income$ 69,507$ 44,216$ 190,869$ 145,150