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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock-Based Compensation Expense | Stock-based compensation expense is summarized as follows:
| Years Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
Stock-based compensation expense | $ | 22,232 |  |  | $ | 23,116 |  |  | $ | 20,288 |
Summary of Restricted Stock Units Activity | RSU activity for the year ended December 31, 2019 is summarized as follows:
| Number of shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2018 | 552,238 |  |  | $ | 111.49 |
Granted | 181,367 |  |  | $ | 108.42 |
Forfeited | (24,019 | ) |  | $ | 95.13 |
Settled | (181,210 | ) |  | $ | 98.20 |
Outstanding at December 31, 2019 | 528,376 |  |  | $ | 115.74 |
Grant-date Intrinsic Value of RSUs Granted | The grant-date intrinsic value of RSUs granted during the year ended December 31, 2019 was $19.7 million.
| Years Ended December 31,
(in millions, except per share values) | 2019 |  | 2018 |  | 2017
Weighted-average grant-date fair value per share | $ | 108.42 |  |  | $ | 131.16 |  |  | $ | 108.32 |
Fair value of RSUs vested | $ | 17.8 |  |  | $ | 12.5 |  |  | $ | 11.3 |
Summary of Stock Option Activity | Stock option activity for the year ended December 31, 2019 is summarized as follows:
| Number of shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2018 | 76,751 |  |  | $ | 12.86 |
Exercised | (70,097 | ) |  | $ | 10.35 |
Outstanding at December 31, 2019 | 6,654 |  |  | $ | 39.35 |
Vested and exercisable at December 31, 2019 | 6,654 |  |  | $ | 39.35 |

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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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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