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Equity Compensation Plans - Deferred Stock Units Activity (Details) - Deferred Stock Units - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Units      
Beginning of period (in shares) 2,336,720 1,878,491 1,848,862
Granted (in shares) 733,096 670,254 565,921
Distributions (in shares) (419,113) (212,025) (504,417)
Forfeited (in shares) (19,898) 0 (31,875)
Balance at End of Period (in shares) 2,630,805 2,336,720 1,878,491
Weighted Average Grant Date Fair Market Value      
Beginning of period (in dollars per share) $ 15.58 $ 15.92 $ 16.46
Granted (in dollars per share) 16.06 15.53 16.01
Distributions (in dollars per share) 15.96 18.37 18.09
Forfeited (in dollars per share) 15.96 0 14.80
Balance at End of Period (in dollars per share) $ 15.66 $ 15.58 $ 15.92