LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Senior Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Carrying Value of Senior Debt	$ 1,213,423	$ 1,243,207
Fair Value of Senior Debt	1,271,189	1,002,890
2013 Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying Value of Senior Debt	20,442	121,230
Fair Value of Senior Debt	20,552	117,926
2014 Floating Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Value of Senior Debt	0	191,497
Fair Value of Senior Debt	0	141,708
2015 Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying Value of Senior Debt	231,812	223,341
Fair Value of Senior Debt	238,052	163,276
2016 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Value of Senior Debt	637,408	487,176
Fair Value of Senior Debt	666,385	373,215
2017 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Value of Senior Debt	323,761	219,963
Fair Value of Senior Debt	$ 346,200	$ 206,765