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DEBT (Details Tables) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2012 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2013 1.00% Convertible Senior Notes Due March 2018 [Member]	Dec. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]
Convertible Debt
Outstanding Principal Amount	$ 1,574,999	$ 1,574,999	$ 574,999	$ 574,999		$ 1,000,000	$ 1,000,000
Unamortized Debt Discount	(161,539)	(172,659)	(48,768)	(54,655)		(112,771)	(118,004)
Carrying value	$ 1,413,460	$ 1,402,340	$ 526,231	$ 520,344		$ 887,229	$ 881,996
Interest rate on Convertible Senior Notes					1.25%			1.00%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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