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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | $ 289,037 |  | $ 289,037 |  | $ 214,406
Earnings from equity method investments | 2,461 | $ 26,540 | 13,677 | $ 74,254 |
Other strategic investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 18,724 |  | 18,724 |  | 33,350
Earnings from equity method investments | 610 | 3,346 | 1,216 | 8,871 |
Oak Hill Funds |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Earnings from equity method investments |  | 600 |  | 4,300 |
Real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 270,313 |  | 270,313 |  | 181,056
Earnings from equity method investments | 1,851 | 23,194 | 12,461 | 65,383 |
Real estate equity investments | Net lease venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 110,153 |  | 110,153 |  | 92,669
Earnings from equity method investments | 962 | 723 | 2,975 | 2,613 |
Real estate equity investments | Safety, Income and Growth, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 75,023 |  | 75,023 |  | 0
Earnings from equity method investments |  | 0 | 388 | 0 |
Real estate equity investments | Marina Palms |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 5,369 |  | 5,369 |  | 35,185
Earnings from equity method investments | 494 | 6,182 | 4,794 | 19,583 |
Real estate equity investments | Other real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, carrying value | 79,768 |  | 79,768 |  | $ 53,202
Earnings from equity method investments | $ 55 | $ 16,289 | $ 4,304 | $ 43,187 |

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