Income Taxes - Components of Income Tax Expense (Benefit) Attributable to Current Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income before income tax expense (benefit)	$ 22,971	$ 26,298	$ 27,327
Current:
Federal tax	669	432	753
State tax	1,294	622	1,087
Foreign tax	103	16	2
Total current	2,066	1,070	1,842
Deferred:
Federal tax	6,811	(55,716)	6,046
State tax	41	1,020	(1,249)
Foreign tax	74	(322)	(57)
Total deferred	6,926	(55,018)	4,740
Income tax expense (benefit)	$ 8,992	$ (53,948)	$ 6,582