SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Weighted average grant date fair value
Liability for cash-settled restricted stock units	$ 10,160		$ 21,731
Restricted Stock Units (RSUs)
Weighted average grant date fair value
Share based compensation costs expense	36,178	$ 40,635
Tax benefits associated with share-based compensation expense	6,036	6,848
Fair value of restricted stock units vested	46,939	49,492
Unrecognized share-based compensation expense	$ 83,978	$ 89,872
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense	2 years 6 months	2 years 6 months
Restricted Stock Units (RSUs) | Cash Settled
Weighted average grant date fair value
Liability for cash-settled restricted stock units	$ 10,160	$ 19,060
Performance Vesting Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	258
Granted (in shares)	97
Vested (in shares)	(27)
Forfeited (in shares)	(39)
Nonvested restricted stock units - end of period (in shares)	289
Weighted average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 53.31
Granted (in usd per share)	62.26
Vested (in usd per share)	64.01
Forfeited (in usd per share)	48.89
Nonvested restricted stock units - end of period (in usd per share)	$ 55.92
Performance Vesting Restricted Stock Units | Cash Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	6
Granted (in shares)	0
Vested (in shares)	(6)
Forfeited (in shares)	0
Nonvested restricted stock units - end of period (in shares)	0
Service Based Restricted Stock Units | Share Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	1,273
Granted (in shares)	802
Vested (in shares)	(479)
Forfeited (in shares)	(63)
Nonvested restricted stock units - end of period (in shares)	1,533
Weighted average grant date fair value
Nonvested restricted stock units - beginning of period (in usd per share)	$ 54.32
Granted (in usd per share)	60.60
Vested (in usd per share)	55.32
Forfeited (in usd per share)	58.00
Nonvested restricted stock units - end of period (in usd per share)	$ 57.14
Service Based Restricted Stock Units | Cash Settled
Number of restricted stock units
Nonvested restricted stock units - beginning of period (in shares)	853
Granted (in shares)	1
Vested (in shares)	(327)
Forfeited (in shares)	(34)
Nonvested restricted stock units - end of period (in shares)	493