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LONG-TERM DEBT (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Long-term Debt    
Long-term debt $ 1,705,638,000 $ 1,773,039,000
4.25% convertible senior notes due June 2014
   
Long-term Debt    
Long-term debt 315,369,000 300,149,000
Interest rate (as a percent) 4.25% 4.25%
Amount of unamortized discount of notes 39,600,000 54,900,000
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 19,000 140,000
Revolving credit facility due July 2016
   
Long-term Debt    
Long-term debt 232,000,000 433,500,000
Partnership's revolving credit facility due November 2015
   
Long-term Debt    
Long-term debt 514,500,000 395,500,000
Partnership's term loan facility due November 2015
   
Long-term Debt    
Long-term debt $ 150,000,000 $ 150,000,000