Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Deferred tax assets	$ 9,000	$ 20,076
Provisional discrete net benefit due to rate change		4,200
Net deferred tax liability	(16,390)
Potential affect of unrecognized tax benefits on effective tax rate	300
Interest accrued on unrecognized tax benefits	100	100
Income tax benefit, recognition of previously unrecognized tax benefits	300	$ 1,100	$ 900
Potential change in unrecognized tax benefits	100
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	1,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 255,000