| **Real Estate Joint Ventures (Tables)**                            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Equity Method Investments and Joint Ventures [Abstract]**        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Summarized Balance Sheets for Unconsolidated Investments           | Summarized financial information for ALP is as follows:  December 31, 2016 December 31, 2015BALANCE SHEETS:   Cash and cash equivalents$11,948 $13,760Other assets59 58Total assets$12,007 $13,818    Accounts payable and other liabilities$955 $1,978Equity(1)11,052 11,840Total liabilities and equity$12,007 $13,818(1)   In 2008, the Company wrote-off its investment in ALP as a result of ALP reserving its assets to satisfy potential claims and obligations in accordance with its publicly reported liquidation basis of accounting.  Subsequently, ALP changed its method of accounting to a going concern basis and reinstated its equity and stated it would report certain expenses as they are incurred. The Company has not recorded any additional equity income as a result of the ALP’s change in accounting. |
| Summarized Statements of Operations for Unconsolidated Investments |  2016 2015 2014STATEMENTS OF OPERATIONS:     Income$371 $— $5Total expenses1,159 3,073 1,957Net loss$788 $3,073 $1,952                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

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