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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2016 |  |  | 1,323 |  |  | $ | 129.04 |  |  |  |  |  |  |
Granted |  |  | 45 |  |  | 189.62 |  |  |  |  |  |  |
Exercised |  |  | (112 | ) |  | 97.82 |  |  | $ | 8,102 |  |  |
Forfeited/Expired |  |  | (370 | ) |  | 110.28 |  |  |  |  |  |  |
Balance as of December 31, 2016 |  |  | 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 |  |  |  |  |  |  |
Exercisable as of December 31, 2018 |  |  | 701 |  |  | $ | 136.01 |  |  | $ | 3,317 |  |  | 5.5
Expected to vest as of December 31, 2018 |  |  | 779 |  |  | $ | 138.20 |  |  |  | 174 |  |  | 9.0
Total |  |  | 1,480 |  |  | $ | 137.16 |  |  | $ | 3,491 |  |  | 7.3
Schedule of Range of Exercise Prices per Share | Stock options outstanding as of December 31, 2018 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, 2018 |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$117.85 - $120.00 |  |  | 23 |  |  | $ | 118.50 |  |  |  | 3.1 |
$120.01 - $150.00 |  |  | 1,174 |  |  | $ | 126.66 |  |  |  | 7.6 |
$150.01 - $180.00 |  |  | 121 |  |  | $ | 168.44 |  |  |  | 5.8 |
$180.01 - $201.25 |  |  | 162 |  |  | $ | 192.40 |  |  |  | 7.3 |
Total |  |  | 1,480 |  |  | $ | 137.16 |  |  |  | 7.3 |
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 $51.68, $68.67, and $75.54 for each share subject to a stock option granted during the years ended December 31, 2018, 2017, and 2016, respectively, based on the following assumptions:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Expected term of options in years |  | 6.3 |  | 6.3 |  | 6.3
Expected volatility |  | 33.7% - 35.5% |  | 37.4% - 37.8% |  | 38.5%
Risk-free interest rate |  | 2.7% - 2.9% |  | 1.9% - 2.3% |  | 1.4% - 1.6%
Expected dividend yield |  | 0.0% |  | 0.0% |  | 0.0%

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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