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Notes Receivable (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Loans Receivable on Real Estate | The following table reconciles the loans receivable on real estate (in thousands):
| 2017 |  |  | 2016 |
Balance at January 1 | $ | 49,488 |  |  | $ | 41,988 |
Additions: |  |  |  |  |  |  |
New mortgage loans |  | — |  |  |  | 11,139 |
Interest |  | 2,276 |  |  |  | 3,160 |
Accretion of discount |  | 269 |  |  |  | 1,038 |
Deductions: |  |  |  |  |  |  |
Collections of principal and interest |  | (32,358 | ) |  |  | (7,837 | )
Balance at December 31 | $ | 19,675 |  |  | $ | 49,488 |

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