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Receivables Rollforward of Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Installment Receivables [Member]	Dec. 31, 2011 Installment Receivables [Member]
Allowance for Doubtful Accounts [Roll Forward]
Balance as of January 1	$ 4,273		$ 4,273	$ 4,841
Current period provision	4,252	8,966	499	1,215
Direct write-offs charged against the allowance			(720)	(1,783)
Balance as of December 31	$ 4,052		$ 4,052	$ 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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