Schedule II - Valuation and Qualifying Accounts (Details) - Valuation reserve for deferred tax assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation Allowances and Reserves
Balance at Beginning of Year	$ 2,956	$ 3,083	$ 4,102
Other Additions	150	632	0
Deductions	(2,324)	(759)	(1,019)
Balance at End of Year	$ 782	$ 2,956	$ 3,083