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Notes Receivable - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2008 | Dec. 31, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Effective interest rates on bonds (as a percent) | 11.42% |  |
Total other-than-temporary impairment loss |  |  | $ 41,961
Impairment charges |  |  | 35,418
Less portion recognized in other comprehensive income |  |  | $ 6,543
Bonds B Series [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Effective interest rates on bonds (as a percent) | 11.42% |  | 14.00%
Total other-than-temporary impairment loss |  |  | $ 42,000
Impairment charges |  | $ 35,400 |
Less portion recognized in other comprehensive income |  |  | $ 6,500

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- Definition Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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- Definition Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 + Details
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