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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Compensation [Abstract] |
Stock Option Activity | The following table is a summary of our stock option activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Six months ended June 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 | (21) | ​ | ​ | 57.91 | ​ | (10) | ​ | ​ | 28.21
Forfeited | (6) | ​ | ​ | 68.84 | ​ | - | ​ | ​ | -
Outstanding at end of the period | 70 | ​ | $ | 49.36 | ​ | 97 | ​ | $ | 52.53
Exercisable at end of the period | 51 | ​ | $ | 42.15 | ​ | 52 | ​ | $ | 40.96
Restricted Stock Activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Six months ended June 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 | 41 | ​ | ​ | 111.94 | ​ | 28 | ​ | ​ | 130.89
Vested | (29) | ​ | ​ | 82.99 | ​ | (31) | ​ | ​ | 45.30
Forfeited | (4) | ​ | ​ | 107.50 | ​ | (2) | ​ | ​ | 167.48
Outstanding at end of the period | 54 | ​ | $ | 116.00 | ​ | 52 | ​ | $ | 92.36

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