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SHARE-BASED COMPENSATION (Share/Cash Settled Restricted Stock Units) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 6,697		$ 13,273
Restricted Stock Units (RSUs)
Weighted  average grant date fair value
Share-based compensation expense	37,394	$ 36,178
Tax benefits associated with share-based compensation expense	6,248	6,036
Fair value of restricted stock units vested	42,582	46,939
Unrecognized share-based compensation expense	$ 95,636	$ 83,978
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense	2 years 7 months 6 days	2 years 6 months
Restricted Stock Units (RSUs) | Cash Settled
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 6,697	$ 10,160
Performance Vesting Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	289
Granted (in shares)	122
Vested (in shares)	(66)
Forfeited (in shares)	(4)
Nonvested restricted stock units - end of period (in shares)	341
Weighted  average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 55.92
Granted (in usd per share)	49.04
Vested (in usd per share)	48.89
Forfeited (in usd per share)	62.26
Nonvested restricted stock units - end of period (in usd per share)	$ 54.74
Service Based Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	1,501
Granted (in shares)	1,234
Vested (in shares)	(555)
Forfeited (in shares)	(76)
Nonvested restricted stock units - end of period (in shares)	2,104
Weighted  average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 56.50
Granted (in usd per share)	48.03
Vested (in usd per share)	56.47
Forfeited (in usd per share)	54.70
Nonvested restricted stock units - end of period (in usd per share)	$ 51.61
Service Based Restricted Stock Units | Cash Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	471
Granted (in shares)	0
Vested (in shares)	(231)
Forfeited (in shares)	(18)
Nonvested restricted stock units - end of period (in shares)	222

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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