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Supplemental Guarantor Financial Information (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
ASSETS        
Current assets $ 1,194,772 $ 1,265,139    
Current assets associated with discontinued operations 397 537    
Total current assets 1,195,169 1,265,676    
Property, plant and equipment, net 3,340,635 3,326,892    
Goodwill 3,738 3,738    
Intangible and other assets, net 225,528 243,372    
Long-term assets associated with discontinued operations 16,506 17,469    
Total long-term assets 3,586,407 3,591,471    
Total assets 4,781,576 4,857,147    
LIABILITIES AND EQUITY        
Current liabilities 495,033 608,652    
Current liabilities associated with discontinued operations 929 2,066    
Total current liabilities 495,962 610,718    
Long-term debt 2,089,762 2,026,902    
Other long-term liabilities 264,176 266,165    
Long-term liabilities associated with discontinued operations 154 317    
Total liabilities 2,850,054 2,904,102    
Total equity 1,931,522 1,953,045 $ 1,948,071 $ 1,813,428
Total liabilities and equity 4,781,576 4,857,147    
Eliminations        
ASSETS        
Investments in affiliates (3,551,727) (3,531,186)    
Intercompany receivables (1,176,669) (1,269,193)    
Total long-term assets (4,728,396) (4,800,379)    
Total assets (4,728,396) (4,800,379)    
LIABILITIES AND EQUITY        
Intercompany payables (1,176,669) (1,269,193)    
Total liabilities (1,176,669) (1,269,193)    
Total equity (3,551,727) (3,531,186)    
Total liabilities and equity (4,728,396) (4,800,379)    
Parent | Reportable Legal Entities        
ASSETS        
Current assets 2,097 4,846    
Total current assets 2,097 4,846    
Investments in affiliates 1,819,718 1,786,572    
Intangible and other assets, net 4,827 5,966    
Intercompany receivables 708,876 727,896    
Total long-term assets 2,533,421 2,520,434    
Total assets 2,535,518 2,525,280    
LIABILITIES AND EQUITY        
Current liabilities 2,485 2,520    
Total current liabilities 2,485 2,520    
Long-term debt 706,500 725,500    
Total liabilities 708,985 728,020    
Total equity 1,826,533 1,797,260    
Total liabilities and equity 2,535,518 2,525,280    
Guarantor Subsidiaries | Reportable Legal Entities        
ASSETS        
Current assets 615,751 649,719    
Total current assets 615,751 649,719    
Property, plant and equipment, net 973,693 1,124,786    
Investments in affiliates 1,732,009 1,744,614    
Intangible and other assets, net 31,441 33,292    
Intercompany receivables 29,480 12,023    
Total long-term assets 2,766,623 2,914,715    
Total assets 3,382,374 3,564,434    
LIABILITIES AND EQUITY        
Current liabilities 260,013 353,851    
Total current liabilities 260,013 353,851    
Long-term debt 891 1,107    
Intercompany payables 1,147,189 1,257,170    
Other long-term liabilities 154,563 165,734    
Total liabilities 1,562,656 1,777,862    
Total equity 1,819,718 1,786,572    
Total liabilities and equity 3,382,374 3,564,434    
Other Subsidiaries | Reportable Legal Entities        
ASSETS        
Current assets 576,924 610,574    
Current assets associated with discontinued operations 397 537    
Total current assets 577,321 611,111    
Property, plant and equipment, net 2,366,942 2,202,106    
Goodwill 3,738 3,738    
Intangible and other assets, net 189,260 204,114    
Intercompany receivables 438,313 529,274    
Long-term assets associated with discontinued operations 16,506 17,469    
Total long-term assets 3,014,759 2,956,701    
Total assets 3,592,080 3,567,812    
LIABILITIES AND EQUITY        
Current liabilities 232,535 252,281    
Current liabilities associated with discontinued operations 929 2,066    
Total current liabilities 233,464 254,347    
Long-term debt 1,382,371 1,300,295    
Intercompany payables 29,480 12,023    
Other long-term liabilities 109,613 100,431    
Long-term liabilities associated with discontinued operations 154 317    
Total liabilities 1,755,082 1,667,413    
Total equity 1,836,998 1,900,399    
Total liabilities and equity $ 3,592,080 $ 3,567,812