Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 666,466	$ 646,458	$ 686,257	$ 643,867
Reclassification from other comprehensive (income) loss				726
Other comprehensive income (loss)	(1)	(8)	(26)	(2)
Ending Balance	666,511	663,672	666,511	663,672
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			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			(26)	(2)
Reclassification from other comprehensive (income) loss				0
Other comprehensive income (loss)			(26)	(2)
Ending Balance	$ (17)	$ (7)	(17)	(7)
Other comprehensive income (loss), before reclassifications, tax			$ 9	$ 1