Share Based Compensation - Restricted Stock Units (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted stock units
Units
Vested (in units)	(600,000)	(1,100,000)	(600,000)
Restricted stock units \| Employee Awards
Units
Nonvested at the beginning of the year (in units)	1,081,760	1,164,224
Granted (in units)	462,316	427,851
Vested (in units)	(433,499)	(489,026)
Forfeited (in units)	(91,370)	(21,289)
Nonvested at the end of the year (in units)	1,019,207	1,081,760	1,164,224
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the year (in dollars per unit)	$ 18.90	$ 16.32
Granted (in dollars per share)	23.28	21.81
Vested (in dollars per unit)	17.55	14.18
Forfeited (in dollars per unit)	20.88	18.97
Nonvested at the end of the year (in dollars per unit)	$ 21.28	$ 18.90	$ 16.32
Restricted stock units \| Director Awards
Units
Nonvested at the beginning of the year (in units)	70,623	55,752
Granted (in units)	49,356	70,623
Vested (in units)	(70,623)	(55,752)
Forfeited (in units)	0	0
Nonvested at the end of the year (in units)	49,356	70,623	55,752
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the year (in dollars per unit)	$ 17.07	$ 20.10
Granted (in dollars per share)	25.53	17.07
Vested (in dollars per unit)	17.07	20.09
Forfeited (in dollars per unit)	0	0
Nonvested at the end of the year (in dollars per unit)	$ 25.53	$ 17.07	$ 20.10
Performance-based stock awards \| Employee Awards
Units
Nonvested at the beginning of the year (in units)	320,681	599,484
Granted (in units)	121,809	523,972
Vested (in units)	(132,095)	(541,923)
Forfeited (in units)	0	(260,852)
Nonvested at the end of the year (in units)	310,395	320,681	599,484
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the year (in dollars per unit)	$ 18.86	$ 17.82
Granted (in dollars per share)	23.66	25.95
Vested (in dollars per unit)	17.47	24.36
Forfeited (in dollars per unit)	0	19.29
Nonvested at the end of the year (in dollars per unit)	$ 21.61	$ 18.86	$ 17.82

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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