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Equity-based Compensation - LTI Target Awards (Details) - Equity Plan [Member] - LTI Target Awards [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Shares/Units  
Unvested shares/units, Beginning Balance (shares) | shares 1,616,963
Granted (shares) | shares 734,057
Vested (shares) | shares (581,122)
Forfeited (shares) | shares (155,802)
Unvested shares/units, Ending Balance (shares) | shares 1,614,096
Weighted-Average Grant Date Fair Value  
Unvested shares, Beginning Balance (in dollars per share) | $ / shares $ 7.57
Granted (in dollars per share) | $ / shares 8.11
Vested (in dollars per share) | $ / shares 8.95
Forfeited (in dollars per share) | $ / shares 8.84
Unvested shares, Ending Balance (in dollars per share) | $ / shares $ 7.20