SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Depreciation and Amortization | |||
| Depreciation and amortization | $ 18,164,000 | $ 16,384,000 | $ 14,662,000 |
| Deferred Financing Costs | |||
| Accumulated amortization of deferred financing costs | 2,090,000 | 4,628,000 | |
| Federal Income Taxes | |||
| Federal excise tax expense | $ 6,000 | $ 174,000 | $ 302,000 |
| Capital gain distributions (as a percent) | 27.00% | 67.00% | 26.00% |
| Commercial properties | |||
| Depreciation and Amortization | |||
| Estimated useful life | 40 years | ||