Schedule II-Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 443	$ 601	$ 691
Additions Charged to Operations or Other Accounts	(89)	(112)	142
Write-offs, net of recoveries	(13)	(46)	(232)
Balance at End of Period	$ 341	$ 443	$ 601