Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 21,199	$ 15,354	$ 7,599
Additions	6,496	6,089	391
Deductions	(4,762)	(75)	(664)
Other changes	(5,896)	(169)	8,028
Balance at end of period	$ 17,037	$ 21,199	$ 15,354