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SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Liability for cash-settled restricted stock units	$ 7,878		$ 20,648
Restricted Stock Units (RSUs)
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Share based compensation costs incurred	15,000	$ 16,000
Tax benefit related to share-based compensation costs	2,000	2,000
Fair value - vested during period	48,000	42,000
Unrecognized compensation costs	$ 121,000	$ 137,000
Unrecognized compensation costs - weighted average period expected to be recognized	2 years 11 months	3 years
Restricted Stock Units (RSUs) | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Liability for cash-settled restricted stock units	$ 8,000	$ 9,000
Performance Vesting Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)	232
Granted (in shares)	127
Vested (in shares)	(61)
Forfeited (in shares)	0
Nonvested restricted stock units - end of period (in shares)	298
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 54.54
Weighted average grant date fair value - granted (in usd per share)	54.70
Weighted average grant date fair value - vested (in usd per share)	53.82
Weighted average grant date fair value - forfeited (in usd per share)	0.00
Weighted average grant date fair value - end of period (in usd per share)	$ 54.76
Performance Vesting Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)	27
Granted (in shares)	0
Vested (in shares)	(12)
Forfeited (in shares)	0
Nonvested restricted stock units - end of period (in shares)	15
Service Based Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)	1,411
Granted (in shares)	508
Vested (in shares)	(445)
Forfeited (in shares)	(74)
Nonvested restricted stock units - end of period (in shares)	1,400
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 54.12
Weighted average grant date fair value - granted (in usd per share)	54.67
Weighted average grant date fair value - vested (in usd per share)	54.04
Weighted average grant date fair value - forfeited (in usd per share)	54.84
Weighted average grant date fair value - end of period (in usd per share)	$ 54.31
Service Based Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)	932
Granted (in shares)	349
Vested (in shares)	(320)
Forfeited (in shares)	(35)
Nonvested restricted stock units - end of period (in shares)	926

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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