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SHARE-BASED COMPENSATION (Share/Cash Settled Restricted Stock Units) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 4,626		$ 13,273
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)	0
Nonvested restricted stock units - end of period (in shares)	345
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)	0
Nonvested restricted stock units - end of period (in usd per share)	$ 54.84
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)	1,180
Vested (in shares)	(523)
Forfeited (in shares)	(20)
Nonvested restricted stock units - end of period (in shares)	2,138
Weighted  average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 56.50
Granted (in usd per share)	47.88
Vested (in usd per share)	56.38
Forfeited (in usd per share)	56.58
Nonvested restricted stock units - end of period (in usd per share)	$ 51.77
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)	(213)
Forfeited (in shares)	(9)
Nonvested restricted stock units - end of period (in shares)	248
Restricted Stock Units (RSUs)
Weighted  average grant date fair value
Share based compensation costs expense	$ 12,339	$ 13,132
Tax benefits associated with share-based compensation expense	1,771	1,889
Fair value of restricted stock units vested	39,981	45,565
Unrecognized share-based compensation expense	$ 122,163	$ 111,909
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense	3 years	2 years 9 months 18 days
Restricted Stock Units (RSUs) | Cash Settled
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 4,626	$ 5,711

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