ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity		$ 10,811,019	$ 9,820,142
Foreign currency translation adjustments, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	[1]	(275,442)	(311,247)
Net unrealized gain on marketable securities, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	[2]	522,497	176,563
Stockholders' equity, before tax		539,700	185,900
Stockholders' equity, before tax, taxable		67,500	37,400
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity		247,055	(134,684)
Net Investment Hedging [Member] | Foreign currency translation adjustments, net of tax | Euro Senior Notes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity		149,900	182,600
Stockholders' equity, before tax		258,000	310,400
Net Investment Hedging [Member] | Foreign currency translation adjustments, net of tax | Foreign Exchange Forward [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity		(35,000)	(35,000)
Stockholders' equity, before tax		(52,600)	(52,600)
Tax and Customs Administration, Netherlands [Member] | Net unrealized gain on marketable securities, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity, before tax, tax-exempt		$ 472,200	$ 148,500

[1] Foreign currency translation adjustments, net of tax, include net losses from fair value adjustments of $35.0 million after tax ($52.6 million before tax) associated with settled derivatives that previously had been designated as net investment hedges at both March 31, 2017 and December 31, 2016.Foreign currency translation adjustments, net of tax, include foreign currency transaction gains of $149.9 million after tax ($258.0 million before tax) and $182.6 million after tax ($310.4 million before tax) associated with the Company's March 2022 Notes, November 2022 Notes, 2024 Notes and 2027 Notes at March 31, 2017 and December 31, 2016, respectively. The March 2022 Notes, November 2022 Notes, 2024 Notes and 2027 Notes are Euro-denominated debt and are designated as hedges of certain of the Company's Euro-denominated net assets (see Note 7). The remaining balance in foreign currency translation adjustments excludes income taxes as a result of the Company's intention to indefinitely reinvest the earnings of its international subsidiaries outside of the United States.

[2] The unrealized gains before tax at March 31, 2017 and December 31, 2016 were $539.7 million and $185.9 million, respectively, of which unrealized gains of $472.2 million and $148.5 million, respectively, were exempt from tax in the Netherlands and unrealized gains of $67.5 million and $37.4 million, respectively, were taxable.