Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Narrative) (Details)

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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
   
Fair value, estimate not practicable [Abstract]    
Face amount of debt $ 34.9 $ 34.6
2.875% Convertible Senior Notes Due 2027 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage 2.875% 2.875%
Level 2 [Member] | 7% Senior Notes Due 2020 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage 7.00% 7.00%
Estimated fair values of senior notes 466.4 461.9
Level 2 [Member] | 2.875% Convertible Senior Notes Due 2027 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage 2.875% 2.875%
Estimated fair values of convertible senior notes $ 224.1 $ 223.0