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Supplemental Guarantor Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
ASSETS        
Current assets $ 1,301,093 $ 1,216,222    
Current assets associated with discontinued operations 20,994 21,746    
Total current assets 1,322,087 1,237,968    
Property, plant and equipment, net 2,859,422 2,842,031    
Intangible and other assets, net 181,246 174,848    
Long-term assets associated with discontinued operations 297      
Total long-term assets 3,040,965 3,016,879    
Total assets 4,363,052 4,254,847    
LIABILITIES AND EQUITY        
Current liabilities 772,641 762,967    
Current liabilities associated with discontinued operations 9,782 11,572    
Total current liabilities 782,423 774,539    
Long-term debt 1,629,654 1,564,923    
Other long-term liabilities 220,087 212,082    
Long-term liabilities associated with discontinued operations 933 1,044    
Total liabilities 2,633,097 2,552,588    
Total equity 1,729,955 1,702,259 1,767,965 1,680,042
Total liabilities and equity 4,363,052 4,254,847    
Parent
        
ASSETS        
Current assets 1,598 142    
Total current assets 1,598 142    
Investments in affiliates 1,722,665 1,631,185    
Intangible and other assets, net 30,976 33,234    
Intercompany receivables 715,860 704,319    
Total long-term assets 2,469,501 2,368,738    
Total assets 2,471,099 2,368,880    
LIABILITIES AND EQUITY        
Current liabilities 13,121 5,844    
Total current liabilities 13,121 5,844    
Long-term debt 896,728 884,423    
Total liabilities 909,849 890,267    
Total equity 1,561,250 1,478,613    
Total liabilities and equity 2,471,099 2,368,880    
Guarantor Subsidiaries
        
ASSETS        
Current assets 781,103 754,303    
Total current assets 781,103 754,303    
Property, plant and equipment, net 1,163,519 1,299,797    
Investments in affiliates 1,529,139 1,145,551    
Intangible and other assets, net 33,175 37,748    
Intercompany receivables 83,499 83,362    
Total long-term assets 2,809,332 2,566,458    
Total assets 3,590,435 3,320,761    
LIABILITIES AND EQUITY        
Current liabilities 497,311 462,668    
Total current liabilities 497,311 462,668    
Long-term debt 378      
Intercompany payables 1,267,604 1,123,427    
Other long-term liabilities 102,477 103,481    
Total liabilities 1,867,770 1,689,576    
Total equity 1,722,665 1,631,185    
Total liabilities and equity 3,590,435 3,320,761    
Other Subsidiaries
        
ASSETS        
Current assets 518,392 461,810    
Current assets associated with discontinued operations 20,994 21,746    
Total current assets 539,386 483,556    
Property, plant and equipment, net 1,695,903 1,542,234    
Intangible and other assets, net 136,363 123,681    
Intercompany receivables 551,744 419,108    
Long-term assets associated with discontinued operations 297      
Total long-term assets 2,384,307 2,085,023    
Total assets 2,923,693 2,568,579    
LIABILITIES AND EQUITY        
Current liabilities 262,209 294,529    
Current liabilities associated with discontinued operations 9,782 11,572    
Total current liabilities 271,991 306,101    
Long-term debt 732,548 680,500    
Intercompany payables 83,499 83,362    
Other long-term liabilities 136,878 128,375    
Long-term liabilities associated with discontinued operations 933 1,044    
Total liabilities 1,225,849 1,199,382    
Total equity 1,697,844 1,369,197    
Total liabilities and equity 2,923,693 2,568,579    
Eliminations
        
ASSETS        
Current assets   (33)    
Total current assets   (33)    
Investments in affiliates (3,251,804) (2,776,736)    
Intangible and other assets, net (19,268) (19,815)    
Intercompany receivables (1,351,103) (1,206,789)    
Total long-term assets (4,622,175) (4,003,340)    
Total assets (4,622,175) (4,003,373)    
LIABILITIES AND EQUITY        
Current liabilities   (74)    
Total current liabilities   (74)    
Intercompany payables (1,351,103) (1,206,789)    
Other long-term liabilities (19,268) (19,774)    
Total liabilities (1,370,371) (1,226,637)    
Total equity (3,251,804) (2,776,736)    
Total liabilities and equity $ (4,622,175) $ (4,003,373)