SCHEDULE II - VALUATION ACCOUNTS (Details) - Accounts receivable, allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation accounts
Balance at Beginning of Period	$ 215	$ 296	$ 980
Additions Charged (Credited) to Expense	697	(26)	(30)
Net (Deductions) Recoveries		(55)	(654)
Balance at End of Period	$ 912	$ 215	$ 296