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CASH, CASH EQUIVALENTS AND AVAILABLE-FOR-SALE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale securities including cash and cash equivalents, Amortized Cost	$ 358,281	$ 214,553
Less amounts classified as cash equivalents, Amortized Cost	(124,713)	(58,605)	(80,940)	(39,554)
Available-for-sale securities, Amortized Cost	233,568	155,948
Available-for-sale securities, Gross Unrealized Gains	14	33
Available-for-sale securities, Gross Unrealized Losses	(40)
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale securities including cash and cash equivalents, Estimated Fair Value	358,255	214,586
Less amounts classified as cash equivalents, Estimated Fair Value	(124,713)	(58,605)
Available-for-sale securities, Estimated Fair Value	233,542	155,981
Cash and money market funds
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale securities including cash and cash equivalents, Amortized Cost	124,713	58,605
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale securities including cash and cash equivalents, Estimated Fair Value	124,713	58,605
U.S. Treasury securities
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale securities including cash and cash equivalents, Amortized Cost	233,568	155,948
Available-for-sale securities, Gross Unrealized Gains	14	33
Available-for-sale securities, Gross Unrealized Losses	(40)
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale securities including cash and cash equivalents, Estimated Fair Value	$ 233,542	$ 155,981