Schedule II Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts Receivable [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Doubtful Accounts Receivable [Member]
Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 155	$ 23	$ 0
Charged to Costs and Expenses	259	168	23
Charged to Other Accounts	0	0	0
Deductions	(80)	(36)	0
Balance at End of Period	$ 334	$ 155	$ 23