Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income before income tax expense	$ 22,971	$ 26,298	$ 27,327
Federal income tax expense at the Federal statutory rate	8,040	9,204	9,564
State income taxes, net of Federal benefit	867	1,021	1,188
Change in valuation allowance	0	(64,159)	(5,087)
Other, including permanent differences	85	(14)	917
Income tax expense (benefit)	$ 8,992	$ (53,948)	$ 6,582
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax at statutory rate	35.00%	35.00%	35.00%
State income taxes, net of Federal tax benefit	3.80%	3.90%	4.30%
Change in valuation allowance	0.00%	(244.00%)	(18.60%)
Other, including permanent differences	0.40%	(0.10%)	3.40%
Income tax expense (benefit)	39.10%	(205.10%)	24.10%