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Income Taxes - Components of Income Taxes (Benefit) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 70,797 | $ 66,756 | $ 57,047
Deferred |  |  |  |  |  |  |  |  | 10,591 | 10,355 | 15,589
Federal |  |  |  |  |  |  |  |  | 81,388 | 77,111 | 72,636
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 4,987 | 5,213 | 4,091
Deferred |  |  |  |  |  |  |  |  | 1,189 | 787 | 1,001
State |  |  |  |  |  |  |  |  | 6,176 | 6,000 | 5,092
Total |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 75,784 | 71,969 | 61,138
Deferred |  |  |  |  |  |  |  |  | 11,780 | 11,142 | 16,590
Income taxes | $ 22,568 | $ 21,092 | $ 21,511 | $ 22,393 | $ 24,293 | $ 17,924 | $ 19,891 | $ 21,003 | $ 87,564 | $ 83,111 | $ 77,728

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