Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 and 2019 follows:

	Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2019	152,631
Granted	74,440
Vested	(27,719)
Forfeited	(1,262)
Adjustment for performance conditions of PBRSUs (1)	(3,368)
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 December 31, 2020 (2)	204,108

(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, 2020, an aggregate of 186,331 PBRSUs and TBRSUs are expected to vest.

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)
2021	$	3,676
2022	2,439
2023	1,004
2024	160
Total	$	7,279