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Stock-Based Compensation - Summary of Nonvested Stock Awards Activity (Details) - Nonvested stock awards (including restricted stock, restricted stock units and performance-based restricted stock units) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares        
Nonvested, beginning balance (shares)   2,116,696    
Granted (shares) 183,751 713,746    
Vested (shares)   (1,523,696)    
Forfeited (shares)   (340,796)    
Nonvested, ending balance (shares)   965,950 2,116,696  
Weighted Average Grant Date Fair Value (Per Share)        
Nonvested, beginning balance (usd per share)   $ 5.36    
Granted (usd per share)   9.42 $ 6.32 $ 4.86
Vested (usd per share)   5.02    
Forfeited (usd per share)   7.51    
Nonvested, ending balance (usd per share)   $ 8.18 $ 5.36