Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Restricted Stock Unit, Activity

A summary of changes in the common shares subject to nonvested PBRSUs and TBRSUs for the years ended December 31, 2022 and 2021 follows:

	Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2021	204,108
Granted	61,890
Vested	(48,106)
Forfeited	(3,522)
Adjustment for performance conditions of PBRSUs (1)	(2,551)
Nonvested at January 1, 2022	211,819
Granted	52,335
Vested	(55,464)
Forfeited	(8,406)
Adjustment for performance conditions of PBRSUs (1)	(634)
Nonvested at December 31, 2022 (2)	199,650

(1) The number of PBRSUs earned depends on the level of achievement with respect to certain performance criteria. Adjustment herein represents the difference between the maximum number of common shares which could be earned and the actual number earned for those PBRSUs as to which the performance period was completed.

(2) Nonvested amount herein represents the maximum number of nonvested PBRSUs and TBRSUs. As of December 31, 2022, an aggregate of 198,737 PBRSUs and TBRSUs are expected to vest.

A summary of awards that vested during the twelve months ended December 31, 2022 and 2021 follows:

	Twelve Months Ended December 31,
	2022	2021
PBRSU and TBRSU vested	55,464	48,106
Common shares withheld to satisfy employee income tax withholding obligations	21,219	18,436
Net common shares issued	34,245	29,670

Share-based Payment Arrangement, Nonvested Award, Cost

The following table details expected additional share-based compensation expense related to PBRSUs and TBRSUs currently outstanding:

(In thousands)
2023	$	4,375
2024	2,869
2025	1,200
2026	193
Total	$	8,637