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Income Taxes - Schedule of Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
U.S. tax at statutory rate	$ 9,900	$ 11,351	$ 11,991
Tax legislation adjustment	(4,325)	0	0
State income taxes, net of federal benefit and tax reform	1,060	945	1,337
Excess equity compensation deduction	(1,139)	(911)	0
Non-deductible expenses	560	495	319
Other	(24)	0	0
Total income tax provision	$ 6,032	$ 11,880	$ 13,647
U.S. tax at statutory rate	35.00%	35.00%	35.00%
Tax legislation adjustment	(15.30%)	0.00%	0.00%
State income taxes, net of federal benefit and tax reform	3.70%	2.90%	3.90%
Excess equity compensation deduction	(4.00%)	(2.80%)	(0.00%)
Nondeductible expenses	2.00%	1.50%	0.90%
Other	(0.10%)	0.00%	0.00%
Total	21.30%	36.60%	39.80%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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