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Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Derivative assets, gross amounts | $ 90,707 | $ 130,403
Derivative assets, amounts offset | (39,795) | (35,764)
Derivative assets, net amounts | 50,912 | 94,639
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 50,912 | 94,639
Liabilities |  |
Derivative liabilities, gross amounts | 93,149 | 110,411
Derivative liabilities, amounts offset | (39,795) | (35,764)
Derivative liabilities, net amounts | 53,354 | 74,647
Derivative liabilities, financial collateral | (53,354) | (74,647)
Derivative liabilities, net amount | 0 | 0
Current assets |  |
Assets |  |
Derivative assets, gross amounts | 45,339 | 91,346
Derivative assets, amounts offset | (19,646) | (20,324)
Derivative assets, net amounts | 25,693 | 71,022
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 25,693 | 71,022
Noncurrent assets |  |
Assets |  |
Derivative assets, gross amounts | 45,368 | 39,057
Derivative assets, amounts offset | (20,149) | (15,440)
Derivative assets, net amounts | 25,219 | 23,617
Derivative assets, financial collateral | 0 | 0
Derivative assets, net amount | 25,219 | 23,617
Current liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 32,616 | 35,184
Derivative liabilities, amounts offset | (19,646) | (20,324)
Derivative liabilities, net amounts | 12,970 | 14,860
Derivative liabilities, financial collateral | (12,970) | (14,860)
Derivative liabilities, net amount | 0 | 0
Noncurrent liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 60,533 | 75,227
Derivative liabilities, amounts offset | (20,149) | (15,440)
Derivative liabilities, net amounts | 40,384 | 59,787
Derivative liabilities, financial collateral | (40,384) | (59,787)
Derivative liabilities, net amount | $ 0 | $ 0

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