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Common Stock Incentive Plan - Restricted Stock (Details) - Restricted Stock - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2021	Jun. 30, 2021
Common Stock Incentive Plan
Shares granted in period (in shares)		112,498
Vesting period (in years)		4 years
Unamortized share-based compensation expense		$ 11.0
Independent directors
Common Stock Incentive Plan
Shares granted in period (in shares)	36,000
Independent directors | Vest immediately
Common Stock Incentive Plan
Shares granted in period (in shares)	24,000
Independent directors | Vest over service period
Common Stock Incentive Plan
Shares granted in period (in shares)	12,000
Vesting period (in years)	3 years

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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