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Notes Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest income | $ 2,678 | $ 2,957 | $ 8,197 | $ 8,874 |
Notes Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest income | $ 2,600 | $ 2,900 | 7,900 | 8,700 |
Payment received relating to notes receivables |  |  | $ 10,900 | $ 11,100 |
Bonds A Series [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity date of notes receivable |  |  |  |  | Jul. 01, 2034
Bonds B Series [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity date of notes receivable |  |  |  |  | Sep. 01, 2037

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