SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents

The following table reconciles cash, cash equivalents and restricted cash and cash equivalents reported in the Consolidated Balance Sheets to the total amount shown in the Consolidated Statements of Cash Flows (in thousands):  

	December 31,
	2017		2016		2015
As included in the Consolidated Balance Sheets:
Cash and cash equivalents	$	2,541,604	$	2,081,075	$	1,477,265
Restricted cash and cash equivalents included in prepaid expenses and other current assets	21,737		932		806
Total cash, cash equivalents and restricted cash and cash equivalents as shown in the Consolidated Statements of Cash Flows	$	2,563,341	$	2,082,007	$	1,478,071