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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 |  |

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