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Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Compensation [Abstract]

Stock Option Activity

​

The following table is a summary of our stock option activity:

​

​	​	​	​	​	​	​	​	​	​
​	Nine months ended September 30,
​	2021				​	2020
​	Awards	​	Weighted-Average Exercise Price		​	Awards	​	Weighted-Average Exercise Price
(awards in thousands)	​	​	​	​	​	​	​	​	​
Outstanding at beginning of period	61	​	$	48.19	​	97	​	$	52.53
Exercised	(16)	​	​	49.69	​	(24)	​	​	58.80
Forfeited	-	​	​	-	​	(6)	​	​	68.84
Outstanding at end of the period	45	​	$	47.66	​	67	​	$	48.71
Exercisable at end of the period	35	​	$	42.00	​	48	​	$	40.83

Restricted Stock Activity

The following table summarizes our restricted stock activity:

​	​	​	​	​	​	​	​	​	​
​	Nine months ended September 30,
​	2021				​	2020
​	Shares	​	Weighted-Average Grant Date Fair Value		​	Shares	​	Weighted-Average Grant Date Fair Value
(shares in thousands)	​	​	​	​	​	​	​	​	​
Outstanding at beginning of period	50	​	$	116.06	​	46	​	$	98.28
Granted	21	​	​	266.99	​	43	​	​	113.68
Vested	(26)	​	​	116.62	​	(30)	​	​	86.79
Forfeited	(3)	​	​	166.02	​	(7)	​	​	108.81
Outstanding at end of the period	42	​	$	183.04	​	52	​	$	116.29

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- References

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- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ 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)
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- 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
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-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

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