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Stock Incentive Plans - Stock Awards Activity (Details)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Weighted- Average Grant Date Fair Value  
Stock of common stock earned for the PSUs vested in 2018 51.75%
Restricted Stock  
Number of Shares  
Beginning Balance (in shares) | shares 630,962
Granted (in shares) | shares 322,444
Vested (in shares) | shares (287,148)
Ending Balance (in shares) | shares 666,258
Weighted- Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 10.66
Granted (in dollars per share) | $ / shares 10.18
Vested (in dollars per share) | $ / shares 11.02
Ending balance (in dollars per share) | $ / shares $ 10.27
Performance Stock Units  
Number of Shares  
Beginning Balance (in shares) | shares 785,797
Granted (in shares) | shares 264,509
Additional units from dividends (in shares) | shares 8,462
Vested (in shares) | shares (218,514)
Ending Balance (in shares) | shares 840,254
Weighted- Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 10.42
Granted (in dollars per share) | $ / shares 9.84
Additional units from dividends (in dollars per share) | $ / shares 11.61
Vested (in dollars per share) | $ / shares 11.98
Ending balance (in dollars per share) | $ / shares $ 9.84