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Share-Based Compensation - Restricted common shares and restricted stock units activity (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Restricted Common Shares
Unvested Shares:
Unvested balance, beginning of year (in shares) | shares	1,635,845
Restricted shares and restricted unit awards granted | shares	1,085,811
Vested (in shares) | shares	(549,892)
Forfeited (in shares) | shares	(100,927)
Unvested balance, end of year (in shares) | shares	2,070,837
Weighted Average Grant Date Fair Value:
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares	$ 36.34
Weighted average grant date fair value | $ / shares	36.14
Vested, weighted average grant date fair value | $ / shares	35.94
Forfeited, weighted average grant date fair value | $ / shares	36.28
Unvested balance, end of year, weighted average grant date fair value | $ / shares	$ 36.35
Restricted Unit Awards
Unvested Shares:
Unvested balance, beginning of year (in shares) | shares	1,121,719
Restricted shares and restricted unit awards granted | shares	175,962
Vested (in shares) | shares	(555,870)
Forfeited (in shares) | shares	(41,945)
Unvested balance, end of year (in shares) | shares	699,866
Weighted Average Grant Date Fair Value:
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares	$ 31.43
Weighted average grant date fair value | $ / shares	35.94
Vested, weighted average grant date fair value | $ / shares	30.46
Forfeited, weighted average grant date fair value | $ / shares	32.23
Unvested balance, end of year, weighted average grant date fair value | $ / shares	$ 33.29

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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