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Income Taxes - Reconciliation of provision for income taxes from continuing operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
"Expected" provision at federal statutory rate									$ 9,654	$ 10,286	$ 18,465
State income taxes, net									1,540	2,029	1,612
Change in valuation allowance									(168)	1,304	(578)
Domestic production activity deduction									0	0	(957)
Compensation limits									148	0	931
Federal and state tax credits									(1,302)	(807)	(1,058)
Tax benefit from the Tax Act									0	0	(3,343)
Other									149	85	117
Total	$ 2,936	$ 3,025	$ 2,642	$ (1,459)	$ 4,452	$ 2,673	$ 3,316	$ 1,255	$ 7,144	$ 11,696	$ 10,935
Effective tax rate									15.60%	23.90%	20.70%
State
Operating Loss Carryforwards [Line Items]
Share-based compensation									$ 459	$ 236	$ 371
Federal
Operating Loss Carryforwards [Line Items]
Share-based compensation									$ (2,877)	$ (1,201)	$ (4,254)

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Effective Income Tax Rate Reconciliation, Compensation Limits. Amount

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