Income Taxes - Unrecognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized tax benefits rollforward
Unrecognized Tax Benefits, Beginning Balance	$ 994	$ 994	$ 1,433
Increases for tax positions taken in prior years			28
Settlements of tax positions taken in prior years			(467)
Unrecognized Tax Benefits, Ending Balance	994	994	994
Portion of unrecognized tax benefits that would impact the effective tax rate if recognized	1,000	1,000	1,000
Tax expense for accrued interest and penalties	100	100	$ 0
Interest and penalties accrued	200	$ 200
Potential increase in unrecognized tax benefits in next 12 months	$ 1,000