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Financing Receivables - Schedule of Activity of Allowance for Potential Future Losses on Mortgage Loans (Details) (Mortgage loan portfolio, USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2013
Provisions
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Dec. 31, 2012
Provisions
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Mar. 31, 2013
Deductions
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Dec. 31, 2012
Deductions
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| Financing Receivable, Allowance for Credit Losses [Roll Forward] | |||||||
| Allowance for uncollectible accounts, Beginning of year | $ 3,400 | $ 3,346 | $ 2,849 | ||||
| Financing receivable, allowance for credit losses, period increase (decrease) | 54 | 497 | 0 | 0 | |||
| Allowance for uncollectible accounts, End of year | $ 3,400 | $ 3,346 | $ 2,849 |