Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 188	$ 160	$ 200
Additions Charged to Costs and Expenses	967	149	327
Deductions	(391)	(121)	(367)
Balance at End of Year	$ 764	$ 188	$ 160