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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Revenue	$ 830,754us-gaap_Revenues	$ 782,231us-gaap_Revenues	$ 756,315us-gaap_Revenues	$ 740,247us-gaap_Revenues	$ 724,455us-gaap_Revenues	$ 756,872us-gaap_Revenues	$ 799,411us-gaap_Revenues	$ 742,249us-gaap_Revenues	$ 3,109,547us-gaap_Revenues	$ 3,022,987us-gaap_Revenues	$ 2,800,933us-gaap_Revenues
Accounts receivable	236,086us-gaap_AccountsReceivableNetCurrent				207,408us-gaap_AccountsReceivableNetCurrent				236,086us-gaap_AccountsReceivableNetCurrent	207,408us-gaap_AccountsReceivableNetCurrent
Google Inc.
Revenue, Major Customer [Line Items]
Revenue									1,400,000	1,500,000	1,400,000
Accounts receivable	$ 118,700				$ 112,300				$ 118,700	$ 112,300