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Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Derivative assets, gross amounts | $ 58,086 | $ 130,403
Derivative assets, gross amounts offset | (34,302) | (35,764)
Derivative assets, current | 8,306 | 71,022
Derivative assets, noncurrent | 15,478 | 23,617
Derivative assets, amounts net of offset | 23,784 | 94,639
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 23,784 | 94,639
Liabilities |  |
Derivative liabilities, gross amounts | 95,315 | 110,411
Derivative liabilities, gross amounts offset | (34,302) | (35,764)
Derivative liabilities, current | 36,471 | 14,860
Derivative liabilities, noncurrent | 24,542 | 59,787
Derivative liabilities, amounts net of offset | 61,013 | 74,647
Derivative liabilities, financial collateral | (61,013) | (74,647)
Derivative liabilities, net amount | 0 | 0
Current assets |  |
Assets |  |
Derivative assets, gross amounts | 21,686 | 91,346
Derivative assets, gross amounts offset | (13,380) | (20,324)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 8,306 | 71,022
Noncurrent assets |  |
Assets |  |
Derivative assets, gross amounts | 36,400 | 39,057
Derivative assets, gross amounts offset | (20,922) | (15,440)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 15,478 | 23,617
Current liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 49,851 | 35,184
Derivative liabilities, gross amounts offset | (13,380) | (20,324)
Derivative liabilities, financial collateral | (36,471) | (14,860)
Derivative liabilities, net amount | 0 | 0
Noncurrent liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 45,464 | 75,227
Derivative liabilities, gross amounts offset | (20,922) | (15,440)
Derivative liabilities, financial collateral | (24,542) | (59,787)
Derivative liabilities, net amount | $ 0 | $ 0

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