Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-based compensation (Restricted stock units and restricted stocks activity) (Details)

v3.19.3.a.u2
Share-based compensation (Restricted stock units and restricted stocks activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted average grant date fair value ($)      
Share based compensation expense $ 69,410 $ 95,176 $ 107,719
Time Based Restricted Stock Units And Restricted Stock      
Number      
Number at beginning of period (in shares) 2,305,202    
Granted (in shares) 413,289    
Vested (in shares) (1,203,452)    
Forfeited (in shares) (10,845)    
Number at end of period (in shares) 1,504,194 2,305,202  
Weighted average grant date fair value ($)      
Number at beginning of period (in USD per share) $ 48.72    
Granted (in USD per share) 54.20    
Vested (in USD per share) 46.71    
Forfeited (in USD per share) 56.20    
Number at end of period (in USD per share) $ 51.78 $ 48.72  
Peformance Based Restricted Stock Units And Restricted Stock      
Number      
Number at beginning of period (in shares) 2,493,307    
Granted (in shares) 378,557    
Vested (in shares) (382,237)    
Forfeited (in shares) (3,491)    
Number at end of period (in shares) 2,486,136 2,493,307  
Weighted average grant date fair value ($)      
Number at beginning of period (in USD per share) $ 50.18    
Granted (in USD per share) 53.44    
Vested (in USD per share) 44.63    
Forfeited (in USD per share) 50.51    
Number at end of period (in USD per share) $ 51.53 $ 50.18  
Restricted Stock | NV Equity Plan      
Number      
Granted (in shares) 580,943    
Weighted average grant date fair value ($)      
Restricted stocks issued (in shares) 372,239    
Shares withheld to pay taxes (in shares) 208,704    
Shares withheld to pay taxes, treated as granted (in shares) 89,299    
Share based compensation expense $ 4,700    
Restricted Stock Units | NV Equity Plan      
Number      
Vested (in shares) (432,427)    
Weighted average grant date fair value ($)      
Shares withheld to pay taxes, treated as granted (in shares) 89,299    
Ordinary shares issued to the holders of these restricted stock units with the remainder being withheld and applied to pay the taxes involved (in shares) 250,470    
Lapsed Restrictions On Restricted Stock | NV Equity Plan      
Weighted average grant date fair value ($)      
Shares withheld to pay taxes, treated as granted (in shares) 681,825    
Restricted stock issued (in shares) 1,006,177