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, 2015	Dec. 31, 2014	Dec. 31, 2013
Amount
Tax expense at statutory rate	$ 18,370	$ 23,110	$ 23,688
State taxes, net	1,590	1,985	2,069
Permanent differences	278	228	(275)
Other	(166)	(173)	163
Income Tax Expense	$ 20,072	$ 25,150	$ 25,645
Percentage
Tax expense at statutory rate (as a percent)	35.00%	35.00%	35.00%
State taxes, net (as a percent)	3.03%	3.01%	3.06%
Permanent differences (as a percent)	0.53%	0.35%	(0.41%)
Other (as a percent)	(0.32%)	(0.27%)	0.24%
Total percentage	38.24%	38.09%	37.89%