NEW ACCOUNTING STANDARDS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective income tax rate reconciliation, stock based compensation, excess tax benefit	$ 7,600
Net cash provided by operating activities	180,946	$ 160,637
Excess tax benefits from stock-based compensation	0	17,287
Net cash used in financing activities	183,200	138,248
ASU 2016-09, excess tax benefit component [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 7,600
ASU 2016-09, tax withholding component [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		6,900
Net cash used in financing activities		$ 6,900