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Stock-Based Compensation - Schedule of Non-vested Share Based RSU's and PRUS's (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock Units (RSUs)      
Number of Shares      
Beginning balance (in shares) 1,865,300    
Granted (in shares) 1,507,609    
Vested (in shares) (1,017,843)    
Forfeited (in shares) (166,101)    
Ending balance (in shares) 2,188,965 1,865,300  
Weighted Average Grant Date Fair Value      
Beginning balance (USD per share) $ 10.55    
Granted (USD per share) 6.28    
Vested (USD per share) 10.89    
Forfeited (USD per share) 7.73    
Ending balance (USD per share) $ 7.66 $ 10.55  
PRSUs      
Number of Shares      
Beginning balance (in shares) 384,245    
Granted (in shares) 275,550 293,083 199,168
Forfeited (in shares) (65,808)    
Ending balance (in shares) 593,987 384,245  
Weighted Average Grant Date Fair Value      
Beginning balance (USD per share) $ 9.01    
Granted (USD per share) 7.26    
Forfeited (USD per share) 10.20    
Ending balance (USD per share) $ 8.06 $ 9.01