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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2016 | 1,754,275 |  |  | $ | 42.12 |  |  | 308,700 |  |  | $ | 86.61 |
Granted | 202,553 |  |  | 102.43 |  |  | 69,064 |  |  | 101.97 |
Options exercised/RSUs vested | (120,823 | ) |  | 31.85 |  |  | (102,810 | ) |  | 81.74 |
Forfeited | (3,044 | ) |  | 79.74 |  |  | (966 | ) |  | 89.01 |
Balance as of September 30, 2017 | 1,832,961 |  |  | $ | 49.41 |  |  | 273,988 |  |  | $ | 92.30 |
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, 2016 | 1,754,275 |  |  | $ | 42.12 |  |  | 308,700 |  |  | $ | 86.61 |
Granted | 202,553 |  |  | 102.43 |  |  | 69,064 |  |  | 101.97 |
Options exercised/RSUs vested | (120,823 | ) |  | 31.85 |  |  | (102,810 | ) |  | 81.74 |
Forfeited | (3,044 | ) |  | 79.74 |  |  | (966 | ) |  | 89.01 |
Balance as of September 30, 2017 | 1,832,961 |  |  | $ | 49.41 |  |  | 273,988 |  |  | $ | 92.30 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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