XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.21.2

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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration