Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 100	$ 130	$ 811
Charged/ (Credit) to Expense	33	(38)	(130)
Charged to Other Accounts	0	0	(442)
Deductions	0	8	(109)
Balance at End of Period	$ 133	$ 100	$ 130