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Non-Controlling Interest Non-Controlling Interest (Narrative) (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |
Non-controlling Interest, Ownership Percentage by Parent |  | 60.00% | 60.00% |  |
Restricted Cash, Current |  | $ 0 |  | $ 13,970,000 | $ 0
Payments of Ordinary Dividends, Noncontrolling Interest | $ 20,000,000 |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 40.00% |  |

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