Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation Plans and Awards - Schedule of activities for RSUs, MSUs and PSUs (Details)

v3.6.0.2
Stock-based Compensation Plans and Awards - Schedule of activities for RSUs, MSUs and PSUs (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
RSUs      
Number      
Unvested at the beginning of the period (in shares) 17,272,085    
Granted (in shares) 15,522,398    
Vested (in shares) (7,666,647)    
Forfeited (in shares) (2,723,419)    
Unvested at the end of the period (in shares) 22,404,417 17,272,085  
Expected to vest at end of the period (in shares) 20,325,998    
Weighted-Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 17.91    
Granted (in dollars per share) 10.21    
Vested (in dollars per share) 16.94    
Forfeited (in dollars per share) 14.84    
Unvested at the end of the period (in dollars per share) 13.26 $ 17.91  
Expected to vest at end of the period (in dollars per share) $ 13.33    
MSUs      
Number      
Unvested at the beginning of the period (in shares) 776,000    
Granted (in shares) 0 776,000  
Vested (in shares) (56,903)    
Forfeited (in shares) (185,714)    
Unvested at the end of the period (in shares) 533,383 776,000  
Expected to vest at end of the period (in shares) 398,831    
Weighted-Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 5.60    
Granted (in dollars per share) 0    
Vested (in dollars per share) 2.57    
Forfeited (in dollars per share) 5.91    
Unvested at the end of the period (in dollars per share) 5.49 $ 5.60  
Expected to vest at end of the period (in dollars per share) $ 5.52    
PSUs      
Number      
Unvested at the beginning of the period (in shares) 0    
Granted (in shares) 1,835,250 0 0
Vested (in shares) 0    
Forfeited (in shares) 0    
Unvested at the end of the period (in shares) 1,835,250 0  
Expected to vest at end of the period (in shares) 1,658,031    
Weighted-Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 0    
Granted (in dollars per share) 5.33    
Vested (in dollars per share) 0    
Forfeited (in dollars per share) 0    
Unvested at the end of the period (in dollars per share) 5.33 $ 0  
Expected to vest at end of the period (in dollars per share) $ 5.32