Schedule II - Valuation and Qualifying Accounts (Schedule II: Valuation and Qualifying Accounts) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Schedule II - Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period		$ 135	$ 213
Charged (Credited) to Costs and Expenses		32
Deductions	[1]		(78)
Balance at End of Period		$ 167	$ 135

[1] Represents net charge-offs of specific receivables.