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Share-based Compensation - Restricted shares and performance shares (Details) - Non-vested restricted shares and performance shares
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Shares  
Outstanding at the beginning of the period (in shares) | shares 2,040
Granted (in shares) | shares 864
Performance award adjustments (in shares) | shares (36)
Vested (in shares) | shares (410)
Forfeited (in shares) | shares (60)
Outstanding at the end of the period (in shares) | shares 2,398
Weighted Average Grant Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 12.73
Granted (in dollars per share) | $ / shares 23.89
Performance award adjustments (in dollars per share) | $ / shares 19.75
Vested (in dollars per share) | $ / shares 13.69
Forfeited (in dollars per share) | $ / shares 14.25
Outstanding at the end of the period (in dollars per share) | $ / shares $ 16.45