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
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 185	$ 399	$ 472
Additions to Bad Debt Expense		107	0	204
Charged to Other Accounts		0	0	0
Deductions	[1]	(66)	(214)	(277)
Balance at End of Period		$ 226	$ 185	$ 399

[1] Deductions represent the actual write-off of accounts receivable balances.