SCHEDULE II - VALUATION ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts
Valuation accounts
Balance at Beginning of Period	$ 949	$ 787	$ 912
Additions Charged (Credited) to Expense	1,610	162	(125)
Balance at End of Period	2,559	949	787
Deferred tax valuation allowance
Valuation accounts
Balance at Beginning of Period	806	1,280	1,280
Additions Charged (Credited) to Expense	(154)	(474)
Balance at End of Period	$ 652	$ 806	$ 1,280