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Equity Investments - Northstar New Jersey (Details) - Northstar NJ - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Incentive compensation cap, percentage of net income |  |  |  | 3.00%
Investee payment to third party cap, percentage of net income |  |  |  | 2.00%
Investee payment to third party, shortfall credit |  | $ 20.0 |  |
Investee payment to third party | $ 15.4 |  |  |
Contribution to investee | $ 2.7 |  |  |
Shortfall payment |  |  | $ 5.9 |

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