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Income Taxes (Details2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes      
Federal statutory income taxes rate (as a percent) 35.00%    
Income tax expense at the statutory rate of 35% $ 31,032 $ 14,080 $ 16,373
Changes resulting from-      
State income taxes, net of federal tax effect 3,432 1,653 1,910
Increase (decrease) in valuation allowance 463 (1,944) 1,465
Increase (decrease) in tax contingency reserves (72) (40) (145)
Increase (decrease) from noncontrolling interests (2,827) (1,938) (450)
Non-deductible expenses 751 704 594
Production activity deduction (1,701) (694) (520)
Purchase accounting adjustments   (46) (472)
Other 146 (161) (607)
Provision for income taxes $ 31,224 $ 11,614 $ 18,148