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Equity - Shares Outstanding (Narrative) (Details) - shares | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Class of Stock [Line Items] |  |
Common stock, shares outstanding (in shares) | 79,542,976 | 81,202,437
2017 Omnibus Incentive Plan |  |
Class of Stock [Line Items] |  |
Common stock, shares outstanding (in shares) | 79,542,976 |
Unvested restricted stock units and performance restricted stock units outstanding (in shares) | 2,348,334 |

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