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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
ASSETS        
Current assets $ 1,133,703 $ 1,119,914    
Current assets associated with discontinued operations 3,871 4,013    
Total current assets 1,137,574 1,123,927    
Property, plant and equipment, net 3,012,581 3,004,452    
Intangible and other assets, net 229,141 232,283    
Total long-term assets 3,241,722 3,236,735    
Total assets 4,379,296 4,360,662    
LIABILITIES AND EQUITY        
Current liabilities 648,256 663,498    
Current liabilities associated with discontinued operations 6,044 6,383    
Total current liabilities 654,300 669,881    
Long-term debt 1,709,451 1,773,039    
Other long-term liabilities 233,118 223,560    
Long-term liabilities associated with discontinued operations 14,462 14,140    
Total liabilities 2,611,331 2,680,620    
Total equity 1,767,965 1,680,042 1,909,757 1,802,424
Total liabilities and equity 4,379,296 4,360,662    
Parent
        
ASSETS        
Current assets 271 93    
Total current assets 271 93    
Investments in affiliates 1,896,309 1,813,197    
Intangible and other assets, net 15,977 18,389    
Intercompany receivables 794,740 945,401    
Total long-term assets 2,707,026 2,776,987    
Total assets 2,707,297 2,777,080    
LIABILITIES AND EQUITY        
Current liabilities 6,832 11,122    
Total current liabilities 6,832 11,122    
Long-term debt 930,109 1,083,649    
Other long-term liabilities 2,391 2,267    
Total liabilities 939,332 1,097,038    
Total equity 1,767,965 1,680,042    
Total liabilities and equity 2,707,297 2,777,080    
Subsidiary Issuer
        
ASSETS        
Investments in affiliates 1,857,520 1,774,029    
Intangible and other assets, net 38,788 39,168    
Intercompany receivables 916,255 1,068,746    
Total long-term assets 2,812,563 2,881,943    
Total assets 2,812,563 2,881,943    
LIABILITIES AND EQUITY        
Current liabilities 1,440 3,147    
Total current liabilities 1,440 3,147    
Long-term debt 143,750 143,750    
Intercompany payables 771,064 921,849    
Total liabilities 916,254 1,068,746    
Total equity 1,896,309 1,813,197    
Total liabilities and equity 2,812,563 2,881,943    
Guarantor Subsidiaries
        
ASSETS        
Current assets 592,451 563,927    
Total current assets 592,451 563,927    
Property, plant and equipment, net 1,387,294 1,513,366    
Investments in affiliates 1,624,916 1,687,806    
Intangible and other assets, net 74,959 78,836    
Intercompany receivables 88,142 99,075    
Total long-term assets 3,175,311 3,379,083    
Total assets 3,767,762 3,943,010    
LIABILITIES AND EQUITY        
Current liabilities 345,541 353,827    
Total current liabilities 345,541 353,827    
Intercompany payables 1,435,051 1,705,911    
Other long-term liabilities 129,650 109,243    
Total liabilities 1,910,242 2,168,981    
Total equity 1,857,520 1,774,029    
Total liabilities and equity 3,767,762 3,943,010    
Other Subsidiaries
        
ASSETS        
Current assets 540,554 555,882    
Current assets associated with discontinued operations 3,871 4,013    
Total current assets 544,425 559,895    
Property, plant and equipment, net 1,625,287 1,491,086    
Intangible and other assets, net 138,205 134,678    
Intercompany receivables 518,797 637,165    
Total long-term assets 2,282,289 2,262,929    
Total assets 2,826,714 2,822,824    
LIABILITIES AND EQUITY        
Current liabilities 307,693 308,320    
Current liabilities associated with discontinued operations 6,044 6,383    
Total current liabilities 313,737 314,703    
Long-term debt 635,592 545,640    
Intercompany payables 111,819 122,627    
Other long-term liabilities 126,188 137,908    
Long-term liabilities associated with discontinued operations 14,462 14,140    
Total liabilities 1,201,798 1,135,018    
Total equity 1,624,916 1,687,806    
Total liabilities and equity 2,826,714 2,822,824    
Eliminations
        
ASSETS        
Current assets 427 12    
Total current assets 427 12    
Investments in affiliates (5,378,745) (5,275,032)    
Intangible and other assets, net (38,788) (38,788)    
Intercompany receivables (2,317,934) (2,750,387)    
Total long-term assets (7,735,467) (8,064,207)    
Total assets (7,735,040) (8,064,195)    
LIABILITIES AND EQUITY        
Current liabilities (13,250) (12,918)    
Total current liabilities (13,250) (12,918)    
Intercompany payables (2,317,934) (2,750,387)    
Other long-term liabilities (25,111) (25,858)    
Total liabilities (2,356,295) (2,789,163)    
Total equity (5,378,745) (5,275,032)    
Total liabilities and equity $ (7,735,040) $ (8,064,195)