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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 24,990 $ 13,266 $ 841
State 2,419 1,606 513
Current tax provision 27,409 14,872 1,354
Deferred:      
Federal 33 0 (265)
State 8 (4) (23)
Deferred tax benefit 41 (4) (288)
Total income tax provision $ 27,450 $ 14,868 $ 1,066