Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 666,511	$ 663,672	$ 686,257	$ 643,867
Reclassification from other comprehensive (income) loss				726
Other comprehensive income (loss)	17	(12)	(9)	(14)
Ending Balance	688,012	677,616	688,012	677,616
Unrealized Gains (Losses) on Securities Available-for-Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			0	(726)
Foreign currency translation adjustments, net of tax of $9 & $1 respectively			0	0
Reclassification from other comprehensive (income) loss				726
Other comprehensive income (loss)			0	726
Ending Balance	0	0	0	0
Reclassification from AOCI, tax				(254)
Foreign  Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			9	(5)
Foreign currency translation adjustments, net of tax of $9 & $1 respectively			(9)	(14)
Reclassification from other comprehensive (income) loss				0
Other comprehensive income (loss)			(9)	(14)
Ending Balance	$ 0	$ (19)	0	(19)
Other comprehensive income (loss), before reclassifications, tax			$ 3	$ 5