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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) - Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Non-vested awards at the beginning of the period (in shares) 1,440    
Granted (in shares) 1,148    
Converted (in shares) 140    
Vested (in shares) (781)    
Canceled (in shares) (219)    
Non-vested awards at the end of the period (in shares) 1,728 1,440  
Weighted Average Grant Date Fair Value Per Share      
Non-vested awards at the beginning of the period (usd per share) $ 10.39    
Granted (usd per share) 9.66 $ 12.95 $ 6.09
Converted (usd per share) 7.03    
Vested (usd per share) 10.44    
Canceled (usd per share) 9.79    
Non-vested awards at the end of the period (usd per share) $ 9.68 $ 10.39