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Equity Compensation Plans - Deferred Stock Units Activity (Details) - Deferred Stock Units - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Units      
Outstanding at beginning of period (in shares) 1,848,862 2,407,154 2,168,824
Granted (in shares) 565,921 565,061 583,958
Distributions (in shares) (504,417) (1,060,459) (335,461)
Forfeited (in shares) (31,875) (62,894) (10,167)
Balance at End of Period (in shares) 1,878,491 1,848,862 2,407,154
Weighted Average Grant Date Fair Market Value      
Outstanding at beginning of period (in dollars per share) $ 16.46 $ 16.45 $ 16.20
Granted (in dollars per share) 16.01 13.33 16.11
Distributions (in dollars per share) 18.09 14.64 14.20
Forfeited (in dollars per share) 14.80 18.66 16.60
Balance at End of Period (in dollars per share) $ 15.92 $ 16.46 $ 16.45