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Receivables Rollforward of Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Doubtful Accounts [Roll Forward]
Balance as of January 1	$ 4,841
Current period provision	11,460	16,979	19,281
Balance as of December 31	4,273	4,841
Installment Receivables [Member]
Allowance for Doubtful Accounts [Roll Forward]
Balance as of January 1	4,841
Current period provision	1,215
Direct write-offs charged against the allowance	(1,783)
Balance as of December 31	$ 4,273

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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