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Commitments and Contingencies (Narrative) (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 21, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Jan. 22, 2015 USD ($) a
Other Commitments [Line Items] |  |  |  |
Percentage of capital committed to strategic investments that may be drawn down |  | 100.00% |  |
Area of land subject to litigation (in acres) | a |  |  |  | 1,250
Net proceeds from sales of land and development assets |  | $ 20,923 | $ 8,775 |
Land & Development | Real Estate Sales |  |  |  |
Other Commitments [Line Items] |  |  |  |
Unpaid purchase price |  |  |  | $ 114,000
Unpaid purchase price, interest rate |  |  |  | 12.00%
Subsequent Event | Real Estate Sales |  |  |  |
Other Commitments [Line Items] |  |  |  |
Net proceeds from sales of land and development assets | $ 231,100 |  |  |
Payments for documentary transfer taxes | 6,300 |  |  |
Sales proceeds from sale of land | 114,000 |  |  |
Proceeds from interest received | 121,800 |  |  |
Proceeds from real estate tax reimbursements | $ 1,600 |  |  |
Participation interests held by third party (as a percent) | 4.30% |  |  |

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