Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Period	$ 1,819	$ 372	$ 221
Additions Charged to Costs and Expenses	4,123	1,547	482
Deductions	(105)	(100)	(331)
Balance at End of Period	5,837	1,819	372
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at Beginning of Period	17,109	17,404	110,829
Deductions	(1,857)	(295)	(93,425)
Balance at End of Period	$ 15,252	$ 17,109	$ 17,404