XML 30 R18.htm IDEA: XBRL DOCUMENT
v3.20.2

Share-based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Share-based Compensation [Abstract] |
Stock Option Activity | The following table is a summary of our stock option activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine months ended September 30,
​ | 2020 | ​ | 2019
​ | Awards | ​ | Weighted-Average Exercise Price | ​ | Awards | ​ | Weighted-Average Exercise Price
(awards in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at beginning of period | 97 | ​ | $ | 52.53 | ​ | 107 | ​ | $ | 49.26
Exercised | (24) | ​ | ​ | 58.80 | ​ | (10) | ​ | ​ | 28.21
Forfeited | (6) | ​ | ​ | 68.84 | ​ | - | ​ | ​ | -
Outstanding at end of the period | 67 | ​ | $ | 48.71 | ​ | 97 | ​ | $ | 52.53
Exercisable at end of the period | 48 | ​ | $ | 40.83 | ​ | 52 | ​ | $ | 40.96
Restricted Stock Activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine months ended September 30,
​ | 2020 | ​ | 2019
​ | Shares | ​ | Weighted-Average Grant Date Fair Value | ​ | Shares | ​ | Weighted-Average Grant Date Fair Value
(shares in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at beginning of period | 46 | ​ | $ | 98.28 | ​ | 57 | ​ | $ | 50.55
Granted | 43 | ​ | ​ | 113.68 | ​ | 28 | ​ | ​ | 130.89
Vested | (30) | ​ | ​ | 86.79 | ​ | (32) | ​ | ​ | 47.14
Forfeited | (7) | ​ | ​ | 108.81 | ​ | (2) | ​ | ​ | 167.48
Outstanding at end of the period | 52 | ​ | $ | 116.29 | ​ | 51 | ​ | $ | 91.98

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 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
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