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Supplemental Guarantor Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
ASSETS        
Current assets $ 1,335,981 $ 1,216,222    
Current assets associated with discontinued operations 23,290 21,746    
Total current assets 1,359,271 1,237,968    
Property, plant and equipment, net 2,835,847 2,842,031    
Intangible and other assets, net 174,522 174,848    
Total long-term assets 3,010,369 3,016,879    
Total assets 4,369,640 4,254,847    
LIABILITIES AND EQUITY        
Current liabilities 741,271 762,967    
Current liabilities associated with discontinued operations 9,657 11,572    
Total current liabilities 750,928 774,539    
Long-term debt 1,642,847 1,564,923    
Other long-term liabilities 222,749 212,082    
Long-term liabilities associated with discontinued operations 938 1,044    
Total liabilities 2,617,462 2,552,588    
Total equity 1,752,178 1,702,259 1,589,555 1,680,042
Total liabilities and equity 4,369,640 4,254,847    
Parent
        
ASSETS        
Current assets 51 142    
Total current assets 51 142    
Investments in affiliates 1,749,550 1,631,185    
Intangible and other assets, net 26,812 33,234    
Intercompany receivables 733,708 704,319    
Total long-term assets 2,510,070 2,368,738    
Total assets 2,510,121 2,368,880    
LIABILITIES AND EQUITY        
Current liabilities 3,300 5,844    
Total current liabilities 3,300 5,844    
Long-term debt 927,841 884,423    
Total liabilities 931,141 890,267    
Total equity 1,578,980 1,478,613    
Total liabilities and equity 2,510,121 2,368,880    
Guarantor Subsidiaries
        
ASSETS        
Current assets 806,027 754,303    
Total current assets 806,027 754,303    
Property, plant and equipment, net 1,171,225 1,299,797    
Investments in affiliates 1,544,979 1,145,551    
Intangible and other assets, net 31,874 37,748    
Intercompany receivables 78,127 83,362    
Total long-term assets 2,826,205 2,566,458    
Total assets 3,632,232 3,320,761    
LIABILITIES AND EQUITY        
Current liabilities 460,973 462,668    
Total current liabilities 460,973 462,668    
Long-term debt 324      
Intercompany payables 1,292,048 1,123,427    
Other long-term liabilities 129,337 103,481    
Total liabilities 1,882,682 1,689,576    
Total equity 1,749,550 1,631,185    
Total liabilities and equity 3,632,232 3,320,761    
Other Subsidiaries
        
ASSETS        
Current assets 529,903 461,810    
Current assets associated with discontinued operations 23,290 21,746    
Total current assets 553,193 483,556    
Property, plant and equipment, net 1,664,622 1,542,234    
Intangible and other assets, net 131,907 123,681    
Intercompany receivables 558,340 419,108    
Total long-term assets 2,354,869 2,085,023    
Total assets 2,908,062 2,568,579    
LIABILITIES AND EQUITY        
Current liabilities 276,998 294,529    
Current liabilities associated with discontinued operations 9,657 11,572    
Total current liabilities 286,655 306,101    
Long-term debt 714,682 680,500    
Intercompany payables 78,127 83,362    
Other long-term liabilities 109,483 128,375    
Long-term liabilities associated with discontinued operations 938 1,044    
Total liabilities 1,189,885 1,199,382    
Total equity 1,718,177 1,369,197    
Total liabilities and equity 2,908,062 2,568,579    
Eliminations
        
ASSETS        
Current assets   (33)    
Total current assets   (33)    
Investments in affiliates (3,294,529) (2,776,736)    
Intangible and other assets, net (16,071) (19,815)    
Intercompany receivables (1,370,175) (1,206,789)    
Total long-term assets (4,680,775) (4,003,340)    
Total assets (4,680,775) (4,003,373)    
LIABILITIES AND EQUITY        
Current liabilities   (74)    
Total current liabilities   (74)    
Intercompany payables (1,370,175) (1,206,789)    
Other long-term liabilities (16,071) (19,774)    
Total liabilities (1,386,246) (1,226,637)    
Total equity (3,294,529) (2,776,736)    
Total liabilities and equity $ (4,680,775) $ (4,003,373)