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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Stock Option Plan Activity | The following is a summary of the Company’s stock option and restricted stock activity and related information:
| Stock Options |  | Restricted Stock Awards
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Grant Date Fair Value
Balance as of December 31, 2017 | 1,876,332 |  |  | $ | 53.17 |  |  | 133,294 |  |  | $ | 91.60 |
Granted | 224,312 |  |  | 161.83 |  |  | 62,033 |  |  | 169.91 |
Options exercised/RSUs vested | (188,998 | ) |  | 61.78 |  |  | (57,497 | ) |  | 82.79 |
Forfeited | (12,228 | ) |  | 104.54 |  |  | (1,165 | ) |  | 125.16 |
Balance as of June 30, 2018 | 1,899,418 |  |  | $ | 64.81 |  |  | 136,665 |  |  | $ | 130.57 |
Schedule of Restricted Stock Activity | The following is a summary of the Company’s stock option and restricted stock activity and related information:
| Stock Options |  | Restricted Stock Awards
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Grant Date Fair Value
Balance as of December 31, 2017 | 1,876,332 |  |  | $ | 53.17 |  |  | 133,294 |  |  | $ | 91.60 |
Granted | 224,312 |  |  | 161.83 |  |  | 62,033 |  |  | 169.91 |
Options exercised/RSUs vested | (188,998 | ) |  | 61.78 |  |  | (57,497 | ) |  | 82.79 |
Forfeited | (12,228 | ) |  | 104.54 |  |  | (1,165 | ) |  | 125.16 |
Balance as of June 30, 2018 | 1,899,418 |  |  | $ | 64.81 |  |  | 136,665 |  |  | $ | 130.57 |

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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=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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