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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2016
Equity [Abstract] |
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 Award
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Grant Date Fair Value
Balance as of December 31, 2015 | 1,683,341 |  |  | $ | 34.23 |  |  | 130,749 |  |  | $ | 60.36 |
Granted | 254,989 |  |  | 90.51 |  |  | 233,955 |  |  | 94.76 |
Exercised | (77,243 | ) |  | 30.73 |  |  | (41,833 | ) |  | 52.18 |
Forfeited | (24,282 | ) |  | 61.99 |  |  | (1,850 | ) |  | 71.48 |
Balance as of June 30, 2016 | 1,836,805 |  |  | $ | 41.83 |  |  | 321,021 |  |  | $ | 73.13 |
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 Award
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Grant Date Fair Value
Balance as of December 31, 2015 | 1,683,341 |  |  | $ | 34.23 |  |  | 130,749 |  |  | $ | 60.36 |
Granted | 254,989 |  |  | 90.51 |  |  | 233,955 |  |  | 94.76 |
Exercised | (77,243 | ) |  | 30.73 |  |  | (41,833 | ) |  | 52.18 |
Forfeited | (24,282 | ) |  | 61.99 |  |  | (1,850 | ) |  | 71.48 |
Balance as of June 30, 2016 | 1,836,805 |  |  | $ | 41.83 |  |  | 321,021 |  |  | $ | 73.13 |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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