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Stock Incentive Plans - Performance Stock Units (Details) - Performance Stock Units - $ / 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 436,170 223,176 0
Number of shares, Granted 218,467 200,685 217,949
Number of shares, Additional shares from dividends 21,722 12,309 5,227
Number of shares, Ending Balance 676,359 436,170 223,176
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 10.95 $ 9.66 $ 0.00
Weighted-average grant date fair value, Granted (in dollars per share) 12.13 12.33 9.64
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) 13.51 12.01 10.37
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 11.41 $ 10.95 $ 9.66