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Income Taxes - Components of income tax expense (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current                      
Current federal income tax expense (benefit)                 $ 29,891 $ 35,286 $ 4,154
Current state income tax expense (benefit)                 6,741 7,256 2,810
Current income tax expense (benefit)                 36,632 42,542 6,964
Deferred                      
Deferred federal income tax expense (benefit)                 10,341 5,579 7,614
Deferred state income tax expense (benefit)                 5,426 6,289 1,082
Deferred income tax expense (benefit)                 15,767 11,868 8,696
Total                      
Federal income tax expense (benefit)                 40,232 40,865 11,768
State income tax expense (benefit)                 12,167 13,545 3,892
Income tax expense (benefit) $ 11,047 $ 15,117 $ 14,821 $ 11,414 $ 14,947 $ 11,827 $ 12,101 $ 15,535 $ 52,399 $ 54,410 $ 15,660