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LONG-TERM DEBT (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2009
Long-term Debt      
Long-term debt $ 1,709,451,000 $ 1,773,039,000  
4.25% convertible senior notes due June 2014
      
Long-term Debt      
Long-term debt 305,109,000 300,149,000  
Interest rate (as a percent) 4.25% 4.25% 4.25%
Amount of unamortized discount of notes 49,900,000 54,900,000 97,900,000
4.75% convertible senior notes due January 2014
      
Long-term Debt      
Long-term debt 143,750,000 143,750,000  
Interest rate (as a percent) 4.75% 4.75%  
7.25% senior notes due December 2018
      
Long-term Debt      
Long-term debt 350,000,000 350,000,000  
Interest rate (as a percent) 7.25% 7.25%  
Other, interest at various rates, collateralized by equipment and other assets
      
Long-term Debt      
Long-term debt 92,000 140,000  
Revolving credit facility due July 2016
      
Long-term Debt      
Long-term debt 275,000,000 433,500,000  
Partnership's revolving credit facility due November 2015
      
Long-term Debt      
Long-term debt 485,500,000 395,500,000  
Partnership's term loan facility due November 2015
      
Long-term Debt      
Long-term debt $ 150,000,000 $ 150,000,000