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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in the allowance for doubtful accounts
Balance, beginning of year	$ 571	$ 262	$ 948
Charged to provision for doubtful accounts	512	661	94
Write-offs	(369)	(352)	(780)
Balance, end of year	$ 714	$ 571	$ 262

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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