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Equity Offering and Stock-Based Compensation Plan (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
1 Months Ended | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
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Sep. 18, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Options granted | 358,239 | ||||
| Stock issued in secondary offering | 5,175,000 | ||||
| Proceeds from share offering | $ 462,900 | ||||
| Weighted average fair value of options granted | $ 45.98 | ||||
| Number of options exercised | 618,006 | 115,660 | 1,265,673 | 207,800 | |
| Increase in equity | 4,000 | 2,100 | 10,000 | 3,600 | |
| Stock option term | 10 years | ||||
| Vesting period | 4 years | ||||
| Unrecognized compensation cost | 64,400 | 64,400 | |||
| Weighted average period for recognition | 3 years 7 months 1 day | ||||
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Restricted Stock Units [Member]
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| Options granted | 191,608 | ||||
| Proceeds from share offering | $ 18,500 | ||||
| Vesting period | 4 years | ||||
| X | ||||||||||
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- Definition
Number of options issued during a secondary offering in the period. No definition available.
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) in stockholders' equity during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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