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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes      
Federal statutory income taxes rate (as a percent) 35.00%    
Income tax expense at the statutory rate of 35% $ 35,371 $ 31,032 $ 14,080
Changes resulting from-      
State income taxes, net of federal tax effect 4,262 3,432 1,653
Increase (decrease) in valuation allowance (1,254) 463 (1,944)
Increase (decrease) in tax contingency reserves 20 (72) (40)
Increase (decrease) from noncontrolling interests   (2,827) (1,938)
Non-deductible expenses 825 751 704
Equity based stock compensation deduction (885)    
Production activity deduction (2,026) (1,701) (694)
Purchase accounting adjustments     (46)
Other (148) 146 (161)
Provision for income taxes $ 36,165 $ 31,224 $ 11,614