LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Senior Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Carrying Amount	$ 1,166,143	$ 1,213,423
Fair Value	1,207,377	1,271,189
2013 Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	0	20,442
Fair Value	0	20,552
2015 Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	234,072	231,812
Fair Value	237,333	238,052
2016 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	618,295	637,408
Fair Value	634,297	666,385
2017 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	313,776	323,761
Fair Value	$ 335,747	$ 346,200