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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2014
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
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Dec. 31, 2013
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
|
Jun. 30, 2014
2.5% Convertible Senior Notes Due 2019 [Member]
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May 31, 2014
2.5% Convertible Senior Notes Due 2019 [Member]
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Jun. 30, 2014
2.875% Convertible Senior Notes Due 2027 [Member]
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Dec. 31, 2013
2.875% Convertible Senior Notes Due 2027 [Member]
|
Jun. 30, 2013
2.875% Convertible Senior Notes Due 2027 [Member]
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Jun. 30, 2014
Level 2 [Member]
7% Senior Notes Due 2020 [Member]
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Dec. 31, 2013
Level 2 [Member]
7% Senior Notes Due 2020 [Member]
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Jun. 30, 2014
Level 2 [Member]
5.375% Senior Notes due 2022 [Member]
|
Jun. 30, 2014
Level 2 [Member]
2.5% Convertible Senior Notes Due 2019 [Member]
|
Jun. 30, 2014
Level 2 [Member]
2.875% Convertible Senior Notes Due 2027 [Member]
|
Dec. 31, 2013
Level 2 [Member]
2.875% Convertible Senior Notes Due 2027 [Member]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt Fair Value [Line Items] | |||||||||||||
| Interest rate, stated percentage | 2.50% | 2.50% | 2.875% | 2.875% | 2.875% | 7.00% | 7.00% | 5.375% | 2.50% | 2.875% | 2.875% | ||
| Estimated fair values of senior notes | $ 467.5 | $ 461.9 | $ 254.4 | ||||||||||
| Estimated fair values of convertible senior notes | 289.2 | 220.0 | 223.0 | ||||||||||
| Fair value, estimate not practicable [Abstract] | |||||||||||||
| Face amount of debt | $ 34.9 | $ 34.6 |