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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compensation cost charged against income |  |  |  |  |  |  |
Operating expenses |  |  |  |  | $ 63,356 | $ 57,111 | $ 52,282
Total employee and non-employee share-based compensation expense included in income, before income tax |  |  |  |  | 63,356 | 57,111 | 52,282
Less: Amount of income tax benefit recognized in earnings |  |  |  |  | (36,326) | (14,892) | (100,635)
Amount charged against net income |  |  |  |  | 27,030 | 42,219 | (48,353)
Operating expense |  |  |  |  |  |  |
Compensation cost charged against income |  |  |  |  |  |  |
Total employee and non-employee share-based compensation expense included in income, before income tax |  |  |  |  | $ 63,400 | $ 57,100 | $ 52,300
Stock options |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Granted (in shares) | 50 | 52 |  | 1,570 |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  |  |  | $ 20.17 | $ 22.37 | $ 18.29
Total intrinsic value of options exercised |  |  |  |  | $ 220,200 | $ 56,800 | $ 285,800
Cash received from option exercises |  |  |  |  | 92,400 | $ 25,900 | $ 52,600
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 80,300 |  |  |  | $ 80,300 |  |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 2 years 3 months 18 days |  |
Stock units expected to vest (in shares) | 14,205 |  |  |  | 14,205 |  |
Restricted stock units |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 29,300 |  |  |  | $ 29,300 |  |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 2 years 7 months 6 days |  |
Stock units expected to vest (in shares) | 700 |  |  |  | 700 |  |
Number of Shares |  |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  |  | 529 | 529 |  |
Granted (in shares) | 1 | 1 | 18 | 548 |  |  |
Vested (in shares) |  |  |  |  | (266) |  |
Forfeited/cancelled (in shares) |  |  |  |  | (6) |  |
Non-vested at the end of the period (in shares) | 825 |  |  |  | 825 | 529 |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  |  |  | $ 51.55 | $ 51.55 |  |
Granted (in dollars per share) | $ 55.73 | $ 66.00 | $ 63.48 | $ 59.66 | 59.79 | $ 57.59 | $ 46.74
Vested (in dollars per share) |  |  |  |  | 50.12 |  |
Forfeited/cancelled (in dollars per share) |  |  |  |  | 59.67 |  |
Non-vested at the end of the period (in dollars per share) | $ 57.62 |  |  |  | $ 57.62 | $ 51.55 |
Incentive Stock Options. |  |  |  |  |  |  |
Compensation cost charged against income |  |  |  |  |  |  |
Total employee and non-employee share-based compensation expense included in income, before income tax |  |  |  |  | $ 10,000 | $ 10,000 | $ 8,700
Non Qualified Stock Options. |  |  |  |  |  |  |
Compensation cost charged against income |  |  |  |  |  |  |
Total employee and non-employee share-based compensation expense included in income, before income tax |  |  |  |  | $ 53,400 | $ 47,100 | $ 43,600

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