LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Senior Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Carrying Amount	$ 916,574	$ 1,213,423
Fair Value	975,613	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	236,391	231,812
Fair Value	249,287	238,052
2016 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	360,032	637,408
Fair Value	381,862	666,385
2017 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	320,151	323,761
Fair Value	$ 344,464	$ 346,200