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:
Valuation and qualifying accounts
Balance at Beginning of Year	$ 198	$ 102	$ 245
Additions Charged to Costs and Expenses	106	96	23
Deductions, Write-offs and Adjustments	21		166
Balance at End of Year	$ 283	$ 198	$ 102