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Stock award plan - Restricted Stock (Details) - Restricted stock awards and units
 12 Months Ended
Dec. 31, 2022
$ / shares
shares
Number of Shares  
Balance at the beginning of the period (in shares) | shares 1,519,831
Granted (in shares) | shares 1,686,467
Vested (in shares) | shares (504,851)
Forfeited (in shares) | shares (185,111)
Balance at the end of the period (in shares) | shares 2,516,336
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 55.43
Granted (in dollars per share) | $ / shares 38.37
Vested (in dollars per share) | $ / shares 50.15
Forfeited (in dollars per share) | $ / shares 46.67
Balance at the end of the period (in dollars per share) | $ / shares $ 45.67