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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Tax at federal statutory rate $ 39,791 $ 28,098 $ 15,078
State income taxes (net of federal benefit) 2,143 1,568 1,037
Domestic production activity deduction (3,727) (2,462) (1,294)
Non deductible expenses and other 435 237 47
Change in tax status of entity - deferred taxes (1) 9 0
Tax at effective rate $ 38,641 $ 27,450 $ 14,868
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax at federal statutory rate 35.00% 35.00% 35.00%
State income taxes (net of federal benefit) 1.90% 2.00% 2.40%
Domestic production activity deduction (3.30%) (3.10%) (3.00%)
Non deductible expenses and other 0.40% 0.30% 0.10%
Change in tax status of entity - deferred taxes 0.00% 0.00% 0.00%
Tax at effective rate 34.00% 34.20% 34.50%