Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021 and 2020 follows:

	Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2020	194,722
Granted	62,265
Vested	(44,379)
Forfeited	(3,101)
Adjustment for performance conditions of PBRSUs (1)	(5,399)
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 December 31, 2021 (2)	211,819

(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, 2021, an aggregate of 206,827 PBRSUs and TBRSUs are expected to vest.

A summary of awards vested during the twelve months ended December 31, 2021 and 2020 follows:

	Twelve Months Ended December 31,
	2021	2020
PBRSU and TBRSU vested	48,106	44,379
Common shares withheld to satisfy employee income tax withholding obligations	18,436	14,038
Net common shares issued	29,670	30,341

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)
2022	$	4,091
2023	2,658
2024	1,107
2025	178
Total	$	8,034