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Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Derivative assets, gross amounts | $ 137,484 | $ 130,403
Derivative assets, gross amounts offset | (40,887) | (35,764)
Derivative assets, current | 53,424 | 71,022
Derivative assets, noncurrent | 43,173 | 23,617
Derivative assets, net amounts | 96,597 | 94,639
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 96,597 | 94,639
Liabilities |  |
Derivative liabilities, gross amounts | 54,402 | 110,411
Derivative liabilities, gross amounts offset | (40,887) | (35,764)
Derivative liabilities, current | 1,798 | 14,860
Derivative liabilities, noncurrent | 11,717 | 59,787
Derivative liabilities, net amounts | 13,515 | 74,647
Derivative liabilities, financial collateral | (13,515) | (74,647)
Derivative liabilities, net amount | 0 | 0
Current assets |  |
Assets |  |
Derivative assets, gross amounts | 69,247 | 91,346
Derivative assets, gross amounts offset | (15,823) | (20,324)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 53,424 | 71,022
Noncurrent assets |  |
Assets |  |
Derivative assets, gross amounts | 68,237 | 39,057
Derivative assets, gross amounts offset | (25,064) | (15,440)
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 43,173 | 23,617
Current liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 17,621 | 35,184
Derivative liabilities, gross amounts offset | (15,823) | (20,324)
Derivative liabilities, financial collateral | (1,798) | (14,860)
Derivative liabilities, net amount | 0 | 0
Noncurrent liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 36,781 | 75,227
Derivative liabilities, gross amounts offset | (25,064) | (15,440)
Derivative liabilities, financial collateral | (11,717) | (59,787)
Derivative liabilities, net amount | $ 0 | $ 0

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