Income Taxes - Schedule of Difference of Income Tax Expense from the United States Federal Income Tax Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amount
Tax expense at statutory rate	$ 13,683	$ 18,370	$ 23,110
State taxes, net	1,278	1,590	1,985
Permanent differences	221	278	228
Other	(242)	(166)	(173)
Income Tax Expense	$ 14,940	$ 20,072	$ 25,150
Percentage
Tax expense at statutory rate (as a percent)	35.00%	35.00%	35.00%
State taxes, net (as a percent)	3.27%	3.03%	3.01%
Permanent differences (as a percent)	0.56%	0.53%	0.35%
Other (as a percent)	(0.62%)	(0.32%)	(0.27%)
Total percentage	38.21%	38.24%	38.09%