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Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets |  |
Derivative assets, gross amounts | $ 30,803 | $ 50,274
Derivative assets, gross amounts offset | (3,753) | (23,369)
Derivative assets, current | 9,002 | 12,779
Derivative assets, noncurrent | 18,048 | 14,126
Derivative assets, amounts net of offset | 27,050 | 26,905
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 27,050 | 26,905
Liabilities |  |
Derivative liabilities, gross amounts | 17,928 | 78,200
Derivative liabilities, gross amounts offset | (3,753) | (23,369)
Derivative liabilities, current | 14,175 | 34,267
Derivative liabilities, noncurrent | 0 | 20,564
Derivative liabilities, amounts net of offset | 14,175 | 54,831
Derivative liabilities, financial collateral | (14,175) | (54,831)
Derivative liabilities, net amount | 0 | 0
Current assets |  |
Assets |  |
Derivative assets, gross amounts | 12,755 | 18,368
Derivative assets, gross amounts offset | (3,753) | (5,589)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 9,002 | 12,779
Noncurrent assets |  |
Assets |  |
Derivative assets, gross amounts | 18,048 | 31,906
Derivative assets, gross amounts offset | 0 | (17,780)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 18,048 | 14,126
Current liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 17,928 | 39,856
Derivative liabilities, gross amounts offset | (3,753) | (5,589)
Derivative liabilities, financial collateral | (14,175) | (34,267)
Derivative liabilities, net amount | 0 | 0
Noncurrent liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts |  | 38,344
Derivative liabilities, gross amounts offset |  | (17,780)
Derivative liabilities, financial collateral |  | (20,564)
Derivative liabilities, net amount |  | $ 0

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