Schedule II Valuation and Qualifying Accounts (Details) (Allowance for doubtful accounts:, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for doubtful accounts:
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 143		$ 143		$ 163
Additions Charged to Costs and Expenses	0		0		0
Deductions	0	[1]	0	[1]	(20)	[1]
Balance at End of Year	$ 143		$ 143		$ 143

[1] Represents write-offs, net of recoveries.