Stock-Based Compensation (Expense) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Summary of employee stock-based compensation expense | ||||
| Stock-based compensation expense | $ 10,603,000 | $ 8,048,000 | $ 29,574,000 | $ 23,451,000 |
| Tax effect on stock-based compensation expense | (2,682,000) | (3,018,000) | (7,482,000) | (8,794,000) |
| Net effect on income | $ 7,921,000 | $ 5,030,000 | $ 22,092,000 | $ 14,657,000 |
| Statutory rate (as a percent) | 25.30% | 37.50% | 25.30% | 37.50% |
| Tax effect on stock-based compensation expense after valuation allowance | $ 0 | $ 0 | ||
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No definition available.
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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