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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Stock-based Compensation

Summary of changes in, the Company's stock option awards

A summary of the status of, and changes in, the Company's stock option awards for the nine months ended September 30, 2021 follows:

​

​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	Weighted-
​	​	​			Weighted-		​	Average
​	​	​	​	​	Average		​	Remaining
​	​	​	​	​	Exercise		​	Contractual
​		Shares			Price			Life
Outstanding at beginning of period	​		39,085		$	23.53	​	​	5.88
Expired	​		(7,479)	​		23.53	​	​	​
Outstanding at end of period	​		31,606		$	23.53		​	5.13
​	​	​	​	​	​	​	​	​	​
Exercisable at end of period	​		31,606		$	23.53		​	5.13

Summary of changes in the Company's RSU, PSU, and DSU awards

A summary of changes in the Company’s RSU, PSU, and DSU awards for the nine months ended September 30, 2021, is as follows:

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

RSU Awards

​

PSU Awards

​

DSU Awards

​

​

​

​

​

Weighted-

​

​

​

​

Weighted-

​

​

​

​

Weighted-

​

​

​

​

Average

​

​

​

Average

​

​

​

Average

​

​

​

​

Grant Date

​

​

​

Grant Date

​

​

​

Grant Date

​

Shares

Fair Value

Shares (1)

Fair Value

Shares

Fair Value

Nonvested at beginning of period

​

1,017,038

$

23.87

​

15,724

$

16.25

​

34,263

$

17.18

Granted

​

260,231

​

24.26

​

99,159

​

23.91

​

35,664

​

24.59

Dividend equivalents earned

​

33,388

​

23.07

​

—

​

—

​

3,716

​

23.15

Vested

​

(128,824)

​

22.88

​

—

​

—

​

(39,813)

​

18.08

Forfeited

​

(29,883)

​

24.88

​

(968)

​

23.48

​

—

​

—

Nonvested at end of period

​

1,151,950

$

24.02

​

113,915

$

22.86

​

33,830

$

24.59

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Vested and outstanding at end of period

​

​

​

​

​

​

​

​

​

​

​

​

96,427

$

21.99

(1) Shares for PSU awards represent target shares at grant date.

Schedule of Stock-based compensation expense

Stock-based compensation expense related to nonvested RSU, PSU, and DSU awards is presented in the table below (dollars in thousands):

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Three Months Ended September 30,

​

Nine Months Ended September 30,

​

2021

2020

2021

2020

Stock-based compensation

​

​

​

​

​

​

​

​

​

​

​

​

RSU awards

​

$

1,316

​

$

2,029

​

$

4,362

​

$

3,952

PSU awards

​

​

290

​

​

41

​

​

619

​

​

41

DSU awards

​

​

231

​

​

135

​

​

741

​

​

420

Total stock-based compensation

​

$

1,837

​

$

2,205

​

$

5,722

​

$

4,413

Schedule of Unamortized stock-based compensation expense

Unamortized stock-based compensation expense related to nonvested RSU, PSU, and DSU awards is presented in the table below (dollars in thousands):

​

​	​	​	​	​	​	​	​
​	​	As of					​
​	​	September 30,		​	December 31,		​
​		2021			2020
Unamortized stock-based compensation	​	​	​	​	​	​	​
RSU awards	​	$	11,650	​	$	10,411	​
PSU awards	​	​	1,554	​	​	179	​
DSU awards	​	​	430	​	​	294	​
Total unamortized stock-based compensation	​	$	13,634	​	$	10,884	​
​	​	​	​	​	​	​	​
Weighted average period over which expense is to be recognized	​	​	3.0	yrs	​	3.0	yrs

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