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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Current:                      
Federal                 $ 7,441 $ 22,522 $ 16,587
State                 2,737 5,163 3,515
Current Income Tax Expense (Benefit), Total                 10,178 27,685 20,102
Deferred:                      
Federal                 18,125 (2,956) (1,498)
State                 2,679 (2,480) (625)
Deferred Income Tax Expense (Benefit)                 20,794 (6,013) (2,523)
Income Tax Expense (Benefit), Total $ 7,584 $ 7,643 $ 9,141 $ 6,614 $ 2,646 $ 7,606 $ 4,163 $ 7,834 $ 30,982 $ 22,249 $ 17,979