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Debt (Union Square Construction Financing) (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 29, 2016 USD ($) loan | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Contractual facility |  | $ 290,879 | $ 252,929 |
Union Square Construction Financing [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 57,500 | 57,500 | $ 57,500 | [1]
Union Square Construction Financing [Member] | Non-Mezzanine Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Advanced-to-Date |  | 26,400 |  |
Union Square Construction Financing [Member] | Senior Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Advanced-to-Date |  | $ 7,500 |  |
Union Square Construction Financing [Member] | Bank Of The Ozarks [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 50,000 |  |  |
Number of loan tranches | loan | 3 |  |  |
Advanced-to-Date | $ 8,000 |  |  |
Facility Limit | 8,000 |  |  |
Union Square Construction Financing [Member] | Tammany Mezz Investor, LLC [Member] | Mezzanine Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 7,500 |  |  |
[1] | The contractual facilities and outstanding balances of the foreign currency denominated borrowings were translated into U.S. dollars based on the applicable exchange rates as of December 31, 2018.

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