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Equity - Restricted Stock and performance-based stock units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted stock and performance-based stock units
Restricted stock and performance based stock units activity
Granted (in shares)	221,542	182,240	167,375
Compensation expense
Remaining compensation expense	$ 8,765,000
Restricted stock and performance-based stock units | 2023
Compensation expense
Remaining compensation expense	5,603,000
Restricted stock and performance-based stock units | 2024
Compensation expense
Remaining compensation expense	2,853,000
Restricted stock and performance-based stock units | 2025
Compensation expense
Remaining compensation expense	$ 309,000
Restricted stock and performance-based stock units | Grant Date Price $42.27 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)	122,865
Granted (in dollars per share)	$ 33.94
Restricted stock and performance-based stock units | Grant Date Price $42.27 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)	86,332
Granted (in dollars per share)	$ 33.94
Restricted stock and performance-based stock units | Grant Date Price $39.40 | Vesting Date, May 27, 2021
Restricted stock and performance based stock units activity
Granted (in shares)	12,345
Restricted stock and performance-based stock units | Grant Date Price $48.95 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)		95,293
Granted (in dollars per share)		$ 42.27
Vesting period	3 years
Restricted stock and performance-based stock units | Grant Date Price $49.98 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)		71,892
Granted (in dollars per share)		$ 42.27
Restricted stock and performance-based stock units | Grant Date Price $38.45 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)		3,000
Granted (in dollars per share)		$ 43.14
Restricted stock and performance-based stock units | Grant Date Price $38.45 | Vesting Date, May 29, 2020
Restricted stock and performance based stock units activity
Granted (in shares)		12,055
Granted (in dollars per share)		$ 39.40
Restricted stock and performance-based stock units | Grant Date Price $46.54 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			76,464
Granted (in dollars per share)			$ 48.95
Vesting period		3 years
Restricted stock and performance-based stock units | Grant Date Price $46.54 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)			66,027
Granted (in dollars per share)			$ 49.98
Restricted stock and performance-based stock units | Grant Date Price $38.18 | Three year vesting
Restricted stock and performance based stock units activity
Vesting period			3 years
Restricted stock and performance-based stock units | Grant Date Price $38.18 | TSR Targets
Restricted stock and performance based stock units activity
Vesting period	4 years
Restricted stock and performance-based stock units | Grant Date Price $38.18 | Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period	3 years
Restricted stock and performance-based stock units | Grant Date Price $44.73 | Vesting Date, May 27, 2021
Restricted stock and performance based stock units activity
Granted (in dollars per share)	$ 38.48
Restricted stock and performance-based stock units | Grant Date Price $44.73 | Vesting Date, May 30, 2019
Restricted stock and performance based stock units activity
Granted (in shares)			9,884
Granted (in dollars per share)			$ 38.45
Restricted stock
Restricted stock and performance based stock units activity
Outstanding at the beginning of the period (in shares)	197,422	180,440	163,569
Granted (in shares)	135,210	110,348	101,348
Vested (in shares)	(103,396)	(93,366)	(84,477)
Outstanding at the end of the period (in shares)	229,236	197,422	180,440
Restricted stock | Grant Date Price $38.45 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			15,000
Granted (in dollars per share)			$ 38.45
Vesting period			3 years
Performance-based stock units
Restricted stock and performance based stock units activity
Outstanding at the beginning of the period (in shares)	0
Granted (in shares)	86,332	71,892	66,027
Vested (in shares)	0	(108,720)	(81,574)
Outstanding at the end of the period (in shares)		0
Compensation expense
Compensation expense related to share-based award	$ 7,964,000	$ 7,760,000	$ 7,012,000

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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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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