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Equity - Restricted Stock (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Restricted stock
Restricted stock awards
Number of shares granted	110,348	101,348
Number of vesting of performance-based stock units (in shares)	93,366	83,477
Performance-based stock units
Restricted stock awards
Number of shares granted	71,892	66,027
Number of vesting of performance-based stock units (in shares)	108,720	81,574
Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	182,240	167,375
Compensation expense related to share-based award	$ 3,810,000	$ 3,539,000
Nonvested awards
Remaining compensation expense	12,554,000
2021 | Restricted stock and performance-based stock units
Nonvested awards
Remaining compensation expense	3,949,000
2022 | Restricted stock and performance-based stock units
Nonvested awards
Remaining compensation expense	5,447,000
2023 | Restricted stock and performance-based stock units
Nonvested awards
Remaining compensation expense	2,855,000
2023 | Restricted stock and performance-based stock units
Nonvested awards
Remaining compensation expense	$ 303,000
Grant Date Price 42.27 | Three year vesting | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	95,293
Granted (in dollars per share)	$ 42.27
Vesting period	3 years
Grant Date Price 42.27 | TSR Targets | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	71,892
Granted (in dollars per share)	$ 42.27
Vesting period	4 years
Grant Date Price 42.27 | Accelerated TSR Targets | Restricted stock and performance-based stock units
Restricted stock awards
Vesting period	3 years
Grant Date Price $48.95 | Three year vesting | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		76,464
Granted (in dollars per share)		$ 48.95
Vesting period		3 years
Grant Date Price $49.98 | TSR Targets | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		66,027
Granted (in dollars per share)		$ 49.98
Vesting period		4 years
Grant Date Price $49.98 | Accelerated TSR Targets | Restricted stock and performance-based stock units
Restricted stock awards
Vesting period		3 years
Grant Date Price $39.40 | Vesting Date, May 26, 2021 | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	12,055
Granted (in dollars per share)	$ 39.40
Grant Date Price $43.14 | Three year vesting | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	3,000
Granted (in dollars per share)	$ 43.14
Grant Date Price $38.45 | Three year vesting | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		15,000
Granted (in dollars per share)		$ 38.45
Vesting period		3 years
Grant Date Price $38.45 | Vesting Date, May 27, 2021 | Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		9,884
Granted (in dollars per share)		$ 38.45

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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