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STOCK-BASED COMPENSATION - Exercise Prices (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Stock options outstanding and stock options exercisable
Number Outstanding (in shares) | shares	18,890
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	5 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 34.61
Options Exercisable (in shares) | shares	10,432
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 23.10
Range of Exercise Prices $5.94 - $5.94
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	5.94
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 5.94
Number Outstanding (in shares) | shares	3,086
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.94
Options Exercisable (in shares) | shares	3,086
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.94
Range of Exercise Prices $6.02 - $17.99
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	6.02
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 17.99
Number Outstanding (in shares) | shares	2,109
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	4 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.13
Options Exercisable (in shares) | shares	2,109
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 16.13
Range of Exercise Prices $18.64 - $23.68
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	18.64
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 23.68
Number Outstanding (in shares) | shares	2,227
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	5 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 22.77
Options Exercisable (in shares) | shares	1,970
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 22.71
Range of Exercise Prices $36.05 - $43.64
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	36.05
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 43.64
Number Outstanding (in shares) | shares	1,932
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 41.59
Options Exercisable (in shares) | shares	683
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 40.41
Range of Exercise Prices $43.99 - $43.99
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	43.99
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 43.99
Number Outstanding (in shares) | shares	2,325
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 43.99
Options Exercisable (in shares) | shares	856
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 43.99
Range of Exercise Prices $44.73 - $45.01
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	44.73
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 45.01
Number Outstanding (in shares) | shares	623
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 44.94
Options Exercisable (in shares) | shares	225
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 44.94
Range of Exercise Prices $45.16 - $45.16
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	45.16
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 45.16
Number Outstanding (in shares) | shares	1,998
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	6 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 45.16
Options Exercisable (in shares) | shares	1,183
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 45.16
Range of Exercise Prices $45.55- $55.20
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	45.55
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 55.20
Number Outstanding (in shares) | shares	1,899
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	8 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 48.24
Options Exercisable (in shares) | shares	313
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 46.81
Range of Exercise Prices $56.08- $57.36
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	56.08
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 57.36
Number Outstanding (in shares) | shares	81
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	9 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 57.16
Options Exercisable (in shares) | shares	1
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 56.08
Range of Exercise Prices $58.73- $67.93
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	58.73
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 67.93
Number Outstanding (in shares) | shares	2,610
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	9 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 58.89
Options Exercisable (in shares) | shares	6
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 62.92

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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+ References

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-Publisher FASB
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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-Publisher FASB
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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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