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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, 2022	Mar. 31, 2021	Dec. 31, 2021
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 3,023		$ 9,091
Restricted Stock Units (RSUs)
Weighted  average grant date fair value
Share-based compensation expense	15,011	$ 12,339
Tax benefits associated with share-based compensation expense	2,426	1,771
Fair value of restricted stock units vested	46,970	39,981
Unrecognized share-based compensation expense	$ 125,964	$ 122,163
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense	2 years 10 months 24 days	3 years
Restricted Stock Units (RSUs) | Cash Settled
Weighted  average grant date fair value
Liability for cash-settled restricted stock units	$ 3,023	$ 4,626
Performance Vesting Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	311
Granted (in shares)	140
Vested (in shares)	(100)
Forfeited (in shares)	0
Nonvested restricted stock units - end of period (in shares)	351
Weighted  average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 54.75
Granted (in usd per share)	68.63
Vested (in usd per share)	54.70
Forfeited (in usd per share)	0
Nonvested restricted stock units - end of period (in usd per share)	$ 60.15
Service Based Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	2,062
Granted (in shares)	927
Vested (in shares)	(646)
Forfeited (in shares)	(21)
Nonvested restricted stock units - end of period (in shares)	2,322
Weighted  average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 51.59
Granted (in usd per share)	56.00
Vested (in usd per share)	52.57
Forfeited (in usd per share)	51.34
Nonvested restricted stock units - end of period (in usd per share)	$ 53.08
Service Based Restricted Stock Units | Cash Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	215
Granted (in shares)	0
Vested (in shares)	(139)
Forfeited (in shares)	(2)
Nonvested restricted stock units - end of period (in shares)	74

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

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