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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Oct. 24, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Number of shares repurchased and retired (shares)		1,808,398	1,612,174
Cost of shares repurchased, including commissions		$ 229,994	$ 180,897
Average cost per share (USD per share)		$ 127.18	$ 112.19
Common stock authorized (shares)		400,000,000		200,000,000	200,000,000
Subsequent Event
Class of Stock [Line Items]
Dividends declared (USD per share)	$ 0.195
Other than accelerated share repurchase program
Class of Stock [Line Items]
Remaining authorized repurchase amount (up to)		$ 568,000

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