STOCK-BASED COMPENSATION - Performance share plans (Details) - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted average grant date fair value
Vested weighted average exercise price (in dollar per share)		$ 69.75
Total Stockholder Return
Number of shares (in thousands)
Nonvested ending Balance (in shares)	240	297	355
Granted (in shares)	137	196	287
Vested (in shares)	(89)	(160)	0
Forfeited (in shares)	(17)	(93)	(345)
Nonvested ending Balance (in shares)	271	240	297
Weighted average grant date fair value
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 64.61	$ 60.35	$ 32.35
Granted the weighted average exercise price (in dollar per share)	28.55	51.52	68.38
Vested weighted average exercise price (in dollar per share)		45.78	0
Forfeited weighted average exercise price (in dollar per share)	57.36	55.82	38.26
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 45.20	$ 64.61	$ 60.35
Relative Revenue Growth
Number of shares (in thousands)
Nonvested ending Balance (in shares)	240	297	355
Granted (in shares)	137	196	287
Vested (in shares)	(89)	(160)	(166)
Forfeited (in shares)	(17)	(93)	(179)
Nonvested ending Balance (in shares)	271	240	297
Weighted average grant date fair value
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 48.52	$ 47.03	$ 39.42
Granted the weighted average exercise price (in dollar per share)	34.15	41.90	50.82
Vested weighted average exercise price (in dollar per share)	51.29	40.10	38.62
Forfeited weighted average exercise price (in dollar per share)	45.35	44.30	45.82
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 40.57	$ 48.52	$ 47.03
Period for recognition (in years)	3 years
Adjusted Earnings Per Share
Number of shares (in thousands)
Nonvested ending Balance (in shares)	0	0	0
Granted (in shares)	116	0	0
Vested (in shares)	0	0	0
Forfeited (in shares)	(2)	0	0
Nonvested ending Balance (in shares)	114	0	0
Weighted average grant date fair value
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 0	$ 0	$ 0
Granted the weighted average exercise price (in dollar per share)	34.16	0	0
Vested weighted average exercise price (in dollar per share)	0	0	0
Forfeited weighted average exercise price (in dollar per share)	34.11	0	0
Nonvested weighted average exercise price beginning balance (in dollar per share)	$ 34.16	$ 0	$ 0
Period for recognition (in years)	3 years

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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