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Supplemental Guarantor Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
ASSETS        
Current assets $ 1,303,147 $ 1,216,222    
Current assets associated with discontinued operations 102 21,746    
Total current assets 1,303,249 1,237,968    
Property, plant and equipment, net 2,832,962 2,842,031    
Intangible and other assets, net 185,520 174,848    
Total long-term assets 3,018,482 3,016,879    
Total assets 4,321,731 4,254,847    
LIABILITIES AND EQUITY        
Current liabilities 730,752 762,967    
Current liabilities associated with discontinued operations 2,364 11,572    
Total current liabilities 733,116 774,539    
Long-term debt 1,564,308 1,564,923    
Other long-term liabilities 230,987 212,082    
Long-term liabilities associated with discontinued operations 396 1,044    
Total liabilities 2,528,807 2,552,588    
Total equity 1,792,924 1,702,259 1,705,539 1,680,042
Total liabilities and equity 4,321,731 4,254,847    
Eliminations
        
ASSETS        
Current assets   (33)    
Total current assets   (33)    
Investments in affiliates (3,297,680) (2,776,736)    
Intangible and other assets, net (12,060) (19,815)    
Intercompany receivables (1,227,449) (1,206,789)    
Total long-term assets (4,537,189) (4,003,340)    
Total assets (4,537,189) (4,003,373)    
LIABILITIES AND EQUITY        
Current liabilities   (74)    
Total current liabilities   (74)    
Intercompany payables (1,227,449) (1,206,789)    
Other long-term liabilities (12,060) (19,774)    
Total liabilities (1,239,509) (1,226,637)    
Total equity (3,297,680) (2,776,736)    
Total liabilities and equity (4,537,189) (4,003,373)    
Parent | Reportable Legal Entities
        
ASSETS        
Current assets 200 142    
Total current assets 200 142    
Investments in affiliates 1,815,122 1,631,185    
Intangible and other assets, net 21,845 33,234    
Intercompany receivables 652,671 704,319    
Total long-term assets 2,489,638 2,368,738    
Total assets 2,489,838 2,368,880    
LIABILITIES AND EQUITY        
Current liabilities 14,111 5,844    
Total current liabilities 14,111 5,844    
Long-term debt 844,220 884,423    
Total liabilities 858,331 890,267    
Total equity 1,631,507 1,478,613    
Total liabilities and equity 2,489,838 2,368,880    
Guarantor Subsidiaries | Reportable Legal Entities
        
ASSETS        
Current assets 758,384 754,303    
Total current assets 758,384 754,303    
Property, plant and equipment, net 1,165,504 1,299,797    
Investments in affiliates 1,482,558 1,145,551    
Intangible and other assets, net 31,618 37,748    
Intercompany receivables 79,452 83,362    
Total long-term assets 2,759,132 2,566,458    
Total assets 3,517,516 3,320,761    
LIABILITIES AND EQUITY        
Current liabilities 415,519 462,668    
Total current liabilities 415,519 462,668    
Long-term debt 270      
Intercompany payables 1,147,997 1,123,427    
Other long-term liabilities 138,608 103,481    
Total liabilities 1,702,394 1,689,576    
Total equity 1,815,122 1,631,185    
Total liabilities and equity 3,517,516 3,320,761    
Other Subsidiaries | Reportable Legal Entities
        
ASSETS        
Current assets 544,563 461,810    
Current assets associated with discontinued operations 102 21,746    
Total current assets 544,665 483,556    
Property, plant and equipment, net 1,667,458 1,542,234    
Intangible and other assets, net 144,117 123,681    
Intercompany receivables 495,326 419,108    
Total long-term assets 2,306,901 2,085,023    
Total assets 2,851,566 2,568,579    
LIABILITIES AND EQUITY        
Current liabilities 301,122 294,529    
Current liabilities associated with discontinued operations 2,364 11,572    
Total current liabilities 303,486 306,101    
Long-term debt 719,818 680,500    
Intercompany payables 79,452 83,362    
Other long-term liabilities 104,439 128,375    
Long-term liabilities associated with discontinued operations 396 1,044    
Total liabilities 1,207,591 1,199,382    
Total equity 1,643,975 1,369,197    
Total liabilities and equity $ 2,851,566 $ 2,568,579