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Share Based Compensation - Summary of Unvested Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares        
Unvested shares/units outstanding at end of period (in shares) 200,000      
Restricted Stock        
Number of Shares        
Unvested shares/units outstanding at beginning of period (in shares) 365,000 1,105,000 1,407,000  
Granted (in shares) 93,000 370,000 671,000  
Vested (in shares) (210,000) (1,066,000) (827,000)  
Forfeited / Canceled (in shares) (15,000) (44,000) (146,000)  
Unvested shares/units outstanding at end of period (in shares) 233,000 365,000 1,105,000  
Weighted- Average Grant Date Fair Value (usd per share)        
Unvested shares/units outstanding (in usd per share) $ 12.66 $ 16.07 $ 22.62 $ 24.32
Granted (in usd per share) 8.06 16.00 19.97  
Vested (in usd per share) 16.29 22.63 23.23  
Forfeited / Canceled (in usd per share) $ 16.25 $ 21.04 $ 23.52  
Aggregate intrinsic value of restricted stock vested during period $ 1.5      
Performance Shares        
Number of Shares        
Unvested shares/units outstanding at beginning of period (in shares) 111,000 183,000 0  
Granted (in shares) 0 111,000 199,000  
Vested (in shares) (19,000) (177,000) 0  
Forfeited / Canceled (in shares) 0 (6,000) (16,000)  
Unvested shares/units outstanding at end of period (in shares) 92,000 111,000 183,000  
Weighted- Average Grant Date Fair Value (usd per share)        
Unvested shares/units outstanding (in usd per share) $ 20.41      
Performance Units        
Number of Shares        
Unvested shares/units outstanding at beginning of period (in shares) 0 49,000 87,000  
Granted (in shares)   0 0  
Vested (in shares)   (48,000) (32,000)  
Forfeited / Canceled (in shares)   (1,000) (6,000)  
Unvested shares/units outstanding at end of period (in shares)   0 49,000  
Weighted- Average Grant Date Fair Value (usd per share)        
Unvested shares/units outstanding (in usd per share)   $ 0