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Share-Based Compensation - Restricted common shares and restricted stock units activity (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted Common Shares
Unvested Shares:
Unvested balance, beginning of year (in shares) | shares	1,045,921
Restricted shares and restricted unit awards granted | shares	1,328,033
Vested (in shares) | shares	(697,090)
Forfeited (in shares) | shares	(41,019)
Unvested balance, end of year (in shares) | shares	1,635,845
Weighted Average Grant Date Fair Value:
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares	$ 31.02
Weighted average grant date fair value | $ / shares	37.58
Vested, weighted average grant date fair value | $ / shares	30.86
Forfeited, weighted average grant date fair value | $ / shares	33.91
Unvested balance, end of year, weighted average grant date fair value | $ / shares	$ 36.34
Restricted Unit Awards
Unvested Shares:
Unvested balance, beginning of year (in shares) | shares	1,563,012
Restricted shares and restricted unit awards granted | shares	207,297
Vested (in shares) | shares	(620,905)
Forfeited (in shares) | shares	(27,685)
Unvested balance, end of year (in shares) | shares	1,121,719
Weighted Average Grant Date Fair Value:
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares	$ 30.07
Weighted average grant date fair value | $ / shares	37.32
Vested, weighted average grant date fair value | $ / shares	29.99
Forfeited, weighted average grant date fair value | $ / shares	30.76
Unvested balance, end of year, weighted average grant date fair value | $ / shares	$ 31.43

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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