Income Taxes - Tax Contingencies Reconciled (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, as of January 1	$ 1,398	$ 2,278
Gross increases (decreases) – tax positions in current period	127	27
Gross increases (decreases) – lapse of statute	(457)	(907)
Total benefit	$ 1,068	$ 1,398