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Stock Incentive Plans - Performance Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted- Average Grant Date Fair Value      
Stock of common stock earned for the PSUs vested (as a percent) 0.00%    
Performance Stock Units      
Number of Units      
Number of shares, Beginning Balance (in shares) 781,923 785,797 686,684
Number of shares, Granted (in shares) 296,050 293,111 266,009
Number of shares, Additional units from dividends 40,662 35,197 33,478
Number of shares, Vested (in shares) (251,375) (218,514) (200,374)
Number of shares, Forfeited (in shares) (70,728) (113,668)  
Number of shares, Ending Balance (in shares) 796,532 781,923 785,797
Weighted- Average Grant Date Fair Value      
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 11.19 $ 10.42 $ 10.65
Weighted-average grant date fair value, Granted (in dollars per share) 10.14 9.82 11.04
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) 10.00 11.24 11.17
Weighted-average grant date fair value, Vested (in dollars per share) 8.80 11.98 12.15
Weighted-average grant date fair value, Forfeited (in dollars per share) 9.93 9.86  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 11.16 $ 11.19 $ 10.42
Stock of common stock earned for the PSUs vested (as a percent) 74.33% 51.75%  
Share based payment, vesting period (years) 3 years