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Share-Based Compensation - Stock option activity (Details) - Stock Options
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of Options / SARs  
Outstanding, beginning of year (in shares) | shares 17,839,333
Granted (in shares) | shares 1,243,984
Exercised (in shares) | shares (1,931,320)
Forfeited or expired (in shares) | shares (68,837)
Outstanding, end of year (in shares) | shares 17,083,160
Exercisable, end of year (in shares) | shares 14,730,147
Weighted Average Exercise Price  
Outstanding, beginning of year, weighted average exercise price | $ / shares $ 23.32
Granted, weighted average exercise price | $ / shares 35.90
Exercised, weighted average exercise price | $ / shares 15.57
Forfeited or expired, weighted average exercise price | $ / shares 35.39
Outstanding, end of year, weighted average exercise price | $ / shares 25.06
Exercisable, end of year, weighted average exercise price | $ / shares $ 23.20
Weighted average contractual term, outstanding, end of year 4 years 4 months 28 days
Weighted average contractual term, exercisable, end of year 3 years 9 months 10 days
Aggregate intrinsic value, outstanding, end of year | $ $ 331,214
Aggregate intrinsic value, exercisable, end of year | $ $ 312,966