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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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 periods indicated:
|  | Stock Options Outstanding
|  |  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average
|  |  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years)
Balance as of January 1, 2017 |  |  | 886 |  |  | $ | 143.89 |  |  |  |  |  |  |
Granted |  |  | 175 |  |  |  | 169.04 |  |  |  |  |  |  |
Exercised |  |  | (12 | ) |  |  | 143.35 |  |  | $ | 541 |  |  |
Forfeited/Expired |  |  | (57 | ) |  |  | 196.52 |  |  |  |  |  |  |
Balance as of December 31, 2017 |  |  | 992 |  |  |  | 145.28 |  |  |  |  |  |  |
Granted |  |  | 710 |  |  |  | 130.27 |  |  |  |  |  |  |
Exercised |  |  | (21 | ) |  |  | 121.13 |  |  | $ | 196 |  |  |
Forfeited/Expired |  |  | (201 | ) |  |  | 154.49 |  |  |  |  |  |  |
Balance as of December 31, 2018 |  |  | 1,480 |  |  |  | 137.16 |  |  |  |  |  |  |
Granted |  |  | 470 |  |  |  | 150.88 |  |  |  |  |  |  |
Exercised |  |  | (51 | ) |  |  | 128.17 |  |  | $ | 799 |  |  |
Forfeited/Expired |  |  | (265 | ) |  |  | 135.88 |  |  |  |  |  |  |
Balance as of December 31, 2019 |  |  | 1,634 |  |  | $ | 141.60 |  |  |  |  |  |  |
Exercisable as of December 31, 2019 |  |  | 847 |  |  | $ | 137.97 |  |  | $ | 12,251 |  |  | 5.0
Expected to vest as of December 31, 2019 |  |  | 787 |  |  | $ | 145.50 |  |  |  | 3,826 |  |  | 9.0
Total |  |  | 1,634 |  |  | $ | 141.60 |  |  | $ | 16,077 |  |  | 6.9
Schedule of Range of Exercise Prices per Share | Stock options outstanding as of December 31, 2019 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):
|  | Stock Options Outstanding at December 31, 2019 |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$119.02 - $140.00 |  |  | 951 |  |  | $ | 125.73 |  |  |  | 5.9 |
$140.01 - $160.00 |  |  | 417 |  |  | $ | 152.20 |  |  |  | 9.9 |
$160.01 - $180.00 |  |  | 113 |  |  | $ | 167.75 |  |  |  | 5.2 |
$180.01 - $201.25 |  |  | 153 |  |  | $ | 192.11 |  |  |  | 6.5 |
Total |  |  | 1,634 |  |  | $ | 141.60 |  |  |  | 6.9 |
Assumptions Used in Black-Scholes Pricing Model | The weighted average grant date fair value of stock option awards using the Black-Scholes option pricing model was $54.36, $51.68, and $68.67 for each share subject to a stock option granted during the years ended December 31, 2019, 2018, and 2017, respectively, based on the following assumptions:
|  | Years Ended December 31,
|  | 2019 |  |  | 2018 |  | 2017
Expected term of options in years |  | 6.3 |  |  | 6.3 |  | 6.3
Expected volatility |  | 33.2% - 33.4% |  |  | 33.7% - 35.5% |  | 37.4% - 37.8%
Risk-free interest rate |  | 1.7% - 2.5% |  |  | 2.7% - 2.9% |  | 1.9% - 2.3%
Expected dividend yield |  |  | 0.0 | % |  | 0.0% |  | 0.0%

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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=116856206&loc=d3e5070-113901 + Details
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