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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the three months ended June 30, 2020:
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual |
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years) |
Balance as of April 1, 2020 |  |  | 1,601 |  |  | $ | 141.41 |  |  |  |  |  |  |  |  |
Granted |  |  | 20 |  |  | $ | 124.48 |  |  |  |  |  |  |  |  |
Exercised |  |  | (12 | ) |  | $ | 127.93 |  |  | $ | 24 |  |  |  |  |
Forfeited/Expired |  |  | (128 | ) |  | $ | 146.13 |  |  |  |  |  |  |  |  |
Balance as of June 30, 2020 |  |  | 1,481 |  |  | $ | 140.88 |  |  |  |  |  |  |  |  |
Exercisable as of June 30, 2020 |  |  | 910 |  |  | $ | 138.40 |  |  | $ | 0 |  |  |  | 4.9 |
Expected to vest as of June 30, 2020 |  |  | 571 |  |  | $ | 144.82 |  |  | $ | 0 |  |  |  | 8.8 |
Total |  |  | 1,481 |  |  | $ | 140.88 |  |  | $ | 0 |  |  |  | 6.4 |
Schedule of Range of Exercise Prices per Share | Stock options outstanding as of June 30, 2020 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):
|  | Stock Options Outstanding at June 30, 2020 |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$119.02 - $140.00 |  |  | 903 |  |  | $ | 125.43 |  |  |  | 5.5 |
$140.01 - $160.00 |  |  | 333 |  |  | $ | 151.60 |  |  |  | 9.4 |
$160.01 - $180.00 |  |  | 95 |  |  | $ | 169.07 |  |  |  | 4.8 |
$180.01 - $201.25 |  |  | 150 |  |  | $ | 192.25 |  |  |  | 6.1 |
Total |  |  | 1,481 |  |  | $ | 140.88 |  |  |  | 6.4 |
Assumptions Used in Black-Scholes Pricing Model | The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $42.50 and $48.84 for each share subject to a stock option granted during the three months ended June 30, 2020 and 2019, respectively, based on the following assumptions:
|  | Three months ended |
|  | June 30, |
|  | 2020 |  | 2019 |
Expected term of options in years |  | 6.3 |  |  | 6.3 |
Expected volatility |  |  | 34.4 | % |  | 33.2% - 33.3% |
Risk-free interest rate |  |  | 0.4 | % |  | 2.0% - 2.3% |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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