Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Allowance For Doubtful Accounts [Member]	Dec. 31, 2010 Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 688	$ 561	$ 395
Additions Charged to Costs and Expenses	20	290	166
Deductions /Write-Offs		(163)
Balance at End of Period	$ 708	$ 688	$ 561