LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes Tables (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument Rollforward [Roll Forward]
Amortization of debt issuance discount	$ 1,952,000	$ 1,836,000
Net Carrying Amount, Beginning Balance	956,956,000
Net Carrying Amount, Ending Balance	958,754,000
2015 Convertible Notes [Member]
Debt Instrument Rollforward [Roll Forward]
Principal Amount of Liability Component, Beginning Balance	261,034,000
Principal Amount of Liability Component, Ending Balance	261,034,000
Unamortized Discount, Beginning Balance	(19,841,000)
Amortization of debt issuance discount	2,483,000
Unamortized Discount, Ending Balance	(17,358,000)
Net Carrying Amount, Beginning Balance	241,193,000
Net Carrying Amount, Ending Balance	243,676,000
Equity Component, Beginning Balance	11,907,000
Equity Component, Ending Balance	$ 11,907,000