Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 17,037	$ 21,199	$ 15,354
Additions	2,805	6,496	6,089
Deductions	0	(4,762)	(75)
Other Changes	1,782	(5,896)	(169)
Balance at end of period	$ 21,624	$ 17,037	$ 21,199