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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of allowance for doubtful accounts activity
Allowance for doubtful accounts, Beginning Balance	$ 1,500	$ 1,700
Provision for doubtful accounts	4,263	1,755	1,494
Write-offs, net of recoveries	(2,763)	(1,955)
Allowance for doubtful accounts, Ending Balance	$ 3,000	$ 1,500	$ 1,700

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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