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Stock-based Compensation - Restricted , Performance and Deferred Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 22, 2021	May 19, 2021	Mar. 24, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Additional disclosures
Compensation expense recognized				$ 1,837		$ 2,205	$ 5,722	$ 4,413
Period over which cost will be recognized							3 years		3 years
RSUs
Shares
Non-vested at beginning of period (in shares)					1,017,038		1,017,038
Granted (in shares)							260,231
Dividend equivalents earned (in shares)							33,388
Vested (in shares)							(128,824)
Forfeited (in shares)							(29,883)
Non-vested at end of period (in shares)				1,151,950			1,151,950		1,017,038
Weighted-Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)					$ 23.87		$ 23.87
Granted (in dollars per share)							24.26
Dividend equivalents earned (in dollars per share)							23.07
Vested (in dollars per share)							22.88
Forfeited (in dollars per share)							24.88
Non-vested at end of period (in dollars per share)				$ 24.02			$ 24.02		$ 23.87
Additional disclosures
Compensation expense recognized				$ 1,316		2,029	$ 4,362	3,952
DSUs
Shares
Non-vested at beginning of period (in shares)					34,263		34,263
Granted (in shares)							35,664
Dividend equivalents earned (in shares)							3,716
Vested (in shares)							(39,813)
Non-vested at end of period (in shares)				33,830			33,830		34,263
Vested and Outstanding at end of period (in shares)				96,427			96,427
Weighted-Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)					$ 17.18		$ 17.18
Granted (in dollars per share)							24.59
Dividend equivalents earned (in dollars per share)							23.15
Vested (in dollars per share)							18.08
Non-vested at end of period (in dollars per share)				$ 24.59			24.59		$ 17.18
Vested and Outstanding at end of period (in dollars per share)				$ 21.99			$ 21.99
Additional disclosures
Compensation expense recognized				$ 231		135	$ 741	420
PSUs
Shares
Non-vested at beginning of period (in shares)					15,724		15,724
Granted (in shares)					28,344		99,159
Forfeited (in shares)							(968)
Non-vested at end of period (in shares)				113,915			113,915		15,724
Weighted-Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)					$ 16.25		$ 16.25
Granted (in dollars per share)							23.91
Forfeited (in dollars per share)							23.48
Non-vested at end of period (in dollars per share)				$ 22.86			$ 22.86		$ 16.25
Additional disclosures
Grant date fair value of the award					$ 700
Compensation expense recognized				$ 290		$ 41	$ 619	$ 41
PSUs | Minimum
Additional disclosures
Vesting percentage (as a percent)					0.00%
PSUs | Maximum
Shares
Granted (in shares)					39,682
Additional disclosures
Vesting percentage (as a percent)					140.00%
Market Based Performance Stock Units
Shares
Granted (in shares)					70,815
Additional disclosures
Grant date fair value of the award					$ 1,700
Market Based Performance Stock Units | Minimum
Additional disclosures
Vesting percentage (as a percent)					0.00%
Market Based Performance Stock Units | Maximum
Shares
Granted (in shares)					113,304
Additional disclosures
Vesting percentage (as a percent)					160.00%
2020 Equity Incentive Plan
Additional disclosures
Remaining shares available for issuance				1,038,975			1,038,975
2020 Equity Incentive Plan | Members of management
Shares
Granted (in shares)	47,805
Additional disclosures
Grant date fair value of the award	$ 1,100
Vesting percentage (as a percent)	100.00%
2020 Equity Incentive Plan | Members of management | Minimum
Additional disclosures
Period over which cost will be recognized	3 years
2020 Equity Incentive Plan | Members of management | Maximum
Additional disclosures
Period over which cost will be recognized	5 years
2020 Equity Incentive Plan | RSUs | Members of management, including the Vice-Chairman of the Board
Shares
Granted (in shares)			212,426
Additional disclosures
Grant date fair value of the award			$ 5,200
Accelerated vesting provision, minimum requisite service period			1 year
Vesting percentage (as a percent)			100.00%
2020 Equity Incentive Plan | RSUs | Members of management, including the Vice-Chairman of the Board | Minimum
Additional disclosures
Period over which cost will be recognized			1 year
2020 Equity Incentive Plan | RSUs | Members of management, including the Vice-Chairman of the Board | Maximum
Additional disclosures
Period over which cost will be recognized			5 years
2020 Equity Incentive Plan | DSUs | Directors and Advisory Directors
Shares
Granted (in shares)			33,288
Additional disclosures
Grant date fair value of the award			$ 800
Period over which cost will be recognized			1 year
Vesting percentage (as a percent)			100.00%
2020 Equity Incentive Plan | DSUs | Directors
Shares
Granted (in shares)		2,376
Additional disclosures
Grant date fair value of the award		$ 100
Period over which cost will be recognized		1 year
Vesting percentage (as a percent)		100.00%

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