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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Current Taxes:        
Federal $ 14,251 $ 12,622 $ 33,678 $ 43,480
State 2,109 1,831 3,860 5,511
Total $ 16,360 $ 14,453 $ 37,538 $ 48,991