Allowance for Credit Losses - Aging of Past-Due Receivables (Details) (Notes Receivable [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Notes Receivable [Member]
Summarizes the Company's aging of past-due notes receivable
30-59 days past due	$ 0	$ 0
60-89 days past due	0	0
> 89 days past due	1,482	1,840
Total past due	$ 1,482	$ 1,840

Financing receivables that are less than 60 days past due but more than 29 days past due.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

+ Details

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

+ References

+ Details

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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