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Share-Based Compensation - Information for Restricted Stock Units under Equity Incentive Plan (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Weighted Average Grant Date Fair Value  
Market price (usd per share) $ 151.08
Restricted stock units and awards  
Shares  
Nonvested, beginning of period, in shares | shares 847,972
Granted, in shares | shares 46,027
Vested, in shares | shares (77,900)
Forfeited, in shares | shares (19,591)
Nonvested, end of period, in shares | shares 796,508
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period, in usd per share $ 236.54
Granted, in usd per share 217.97
Vested, in usd per share 205.91
Forfeited, in usd per share 220.12
Nonvested, end of period, in usd per share $ 238.86
Restricted stock units and awards | Retention Plan for SVB Leerink  
Weighted Average Grant Date Fair Value  
Award vesting period 5 years