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Variable Interest Entities - Grey Ranch, L.P. - Assets and Liabilities Included in Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 309,766 $ 207,681 $ 5,863 $ 7,861
Accounts receivable, net 445,506 206,336    
Inventory 3,618 6,903    
Prepaid expenses 31,319 14,099    
Total current assets 1,142,885 441,840    
Other property, plant and equipment, net 582,375 522,269    
Total assets 9,790,731 6,219,609    
Accounts payable and accrued expenses 766,544 506,784    
Total liabilities 5,928,276 3,670,659    
Grey Ranch Plant, L.P
        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 1,080 1,702    
Accounts receivable, net 20 24    
Inventory 109 109    
Prepaid expenses 64 176    
Total current assets 1,273 2,011    
Other property, plant and equipment, net 1,246 14,985    
Total assets 2,519 16,996    
Accounts payable and accrued expenses 274 280    
Total liabilities $ 274 $ 280