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Receivables Rollforward of Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Roll Forward]
Balance as of January 1	$ 3,823
Current period provision	3,689	5,179	11,460
Balance as of December 31	6,039	3,823
Installment Receivables [Member]
Allowance for Doubtful Accounts [Roll Forward]
Balance as of January 1	3,823	4,273
Current period provision	3,457	458
Direct write-offs charged against the allowance	(1,241)	(908)
Balance as of December 31	$ 6,039	$ 3,823

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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