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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Change in Allowance for Uncollectible Accounts Receivable
Beginning balance, allowance for uncollectible accounts receivable	$ 2,494	$ 2,045	$ 4,106
Provision, charged to expense	518	2	199
Provision, direct reduction to revenue and other accounts	104	602	595
Deductions to provision	(2,515)	(155)	(2,855)
Ending balance, allowance for uncollectible accounts receivable	$ 601	$ 2,494	$ 2,045

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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