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Supplemental Guarantor Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
ASSETS        
Current assets $ 1,264,122 $ 1,220,689    
Current assets associated with discontinued operations 293 442    
Total current assets 1,264,415 1,221,131    
Property, plant and equipment, net 3,175,249 2,820,272    
Intangible and other assets, net 203,758 164,836    
Long-term assets associated with discontinued operations 19,695 20,918    
Total long-term assets 3,398,702 3,006,026    
Total assets 4,663,117 4,227,157    
LIABILITIES AND EQUITY        
Current liabilities 587,696 637,473    
Current liabilities associated with discontinued operations 2,215 3,233    
Total current liabilities 589,911 640,706    
Long-term debt 1,852,568 1,502,155    
Other long-term liabilities 272,260 270,421    
Long-term liabilities associated with discontinued operations 307 447    
Total liabilities 2,715,046 2,413,729    
Total equity 1,948,071 1,813,428 1,752,178 1,702,259
Total liabilities and equity 4,663,117 4,227,157    
Eliminations
        
ASSETS        
Investments in affiliates (3,581,634) (3,531,346)    
Intangible and other assets, net   (11,230)    
Intercompany receivables (1,444,289) (1,184,878)    
Total long-term assets (5,025,923) (4,727,454)    
Total assets (5,025,923) (4,727,454)    
LIABILITIES AND EQUITY        
Intercompany payables (1,444,289) (1,184,878)    
Other long-term liabilities   (11,230)    
Total liabilities (1,444,289) (1,196,108)    
Total equity (3,581,634) (3,531,346)    
Total liabilities and equity (5,025,923) (4,727,454)    
Parent | Reportable Legal Entities
        
ASSETS        
Current assets 7,722 141    
Total current assets 7,722 141    
Investments in affiliates 1,755,649 1,851,131    
Intangible and other assets, net 6,981 20,060    
Intercompany receivables 811,968 536,382    
Total long-term assets 2,574,598 2,407,573    
Total assets 2,582,320 2,407,714    
LIABILITIES AND EQUITY        
Current liabilities 2,589 2,963    
Total current liabilities 2,589 2,963    
Long-term debt 809,500 742,661    
Total liabilities 812,089 745,624    
Total equity 1,770,231 1,662,090    
Total liabilities and equity 2,582,320 2,407,714    
Guarantor Subsidiaries | Reportable Legal Entities
        
ASSETS        
Current assets 686,801 710,801    
Total current assets 686,801 710,801    
Property, plant and equipment, net 1,141,207 1,143,111    
Investments in affiliates 1,825,985 1,680,215    
Intangible and other assets, net 28,117 29,555    
Intercompany receivables 13,218 14,818    
Total long-term assets 3,008,527 2,867,699    
Total assets 3,695,328 3,578,500    
LIABILITIES AND EQUITY        
Current liabilities 328,664 369,829    
Total current liabilities 328,664 369,829    
Long-term debt 1,332 1,539    
Intercompany payables 1,431,071 1,170,060    
Other long-term liabilities 178,612 185,941    
Total liabilities 1,939,679 1,727,369    
Total equity 1,755,649 1,851,131    
Total liabilities and equity 3,695,328 3,578,500    
Other Subsidiaries | Reportable Legal Entities
        
ASSETS        
Current assets 569,599 509,747    
Current assets associated with discontinued operations 293 442    
Total current assets 569,892 510,189    
Property, plant and equipment, net 2,034,042 1,677,161    
Intangible and other assets, net 168,660 126,451    
Intercompany receivables 619,103 633,678    
Long-term assets associated with discontinued operations 19,695 20,918    
Total long-term assets 2,841,500 2,458,208    
Total assets 3,411,392 2,968,397    
LIABILITIES AND EQUITY        
Current liabilities 256,443 264,681    
Current liabilities associated with discontinued operations 2,215 3,233    
Total current liabilities 258,658 267,914    
Long-term debt 1,041,736 757,955    
Intercompany payables 13,218 14,818    
Other long-term liabilities 93,648 95,710    
Long-term liabilities associated with discontinued operations 307 447    
Total liabilities 1,407,567 1,136,844    
Total equity 2,003,825 1,831,553    
Total liabilities and equity $ 3,411,392 $ 2,968,397