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Stock Incentive Plans - Restricted Stock Awards (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of shares, Beginning Balance 514,419 583,021 676,111
Number of shares, Granted 216,159 249,311 323,526
Number of shares, Additional shares from dividends     1,040
Number of shares, Forfeited (183) (537) (16,934)
Number of shares, Vested (255,828) (317,376) (400,722)
Number of shares, Ending Balance 474,567 514,419 583,021
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 10.82 $ 9.80 $ 10.10
Weighted-average grant date fair value, Granted (in dollars per share) 14.48 12.39 9.33
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share)     9.30
Weighted-average grant date fair value, Forfeited (in dollars per share) 9.08 9.32 9.65
Weighted-average grant date fair value, Vested (in dollars per share) 10.39 10.19 9.94
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 12.72 $ 10.82 $ 9.80