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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Derivative assets, gross amounts | $ 3,040 | $ 5,582
Derivative assets, gross amounts offset | (3,040) | (4,272)
Derivative assets, amounts net of offset | 0 | 1,310
Financial collateral (obligation to return cash) | 0 | 0
Derivative assets, net amount | 0 | 1,310
Liabilities |  |
Derivative liabilities, gross amounts | 28,135 | 18,467
Derivative liabilities, gross amounts offset | (3,040) | (4,272)
Derivative liabilities, amounts net of offset | 25,095 | 14,195
Financial collateral (right to reclaim cash) | (25,095) | (14,195)
Derivative liabilities, net amount | 0 | 0
Current assets |  |
Assets |  |
Derivative assets, gross amounts | 3,040 | 5,582
Derivative assets, gross amounts offset | (3,040) | (4,272)
Derivative assets, amounts net of offset | 0 | 1,310
Financial collateral (obligation to return cash) | 0 | 0
Derivative assets, net amount | 0 | 1,310
Noncurrent assets |  |
Assets |  |
Derivative assets, gross amounts | 0 | 0
Derivative assets, gross amounts offset | 0 | 0
Derivative assets, amounts net of offset | 0 | 0
Financial collateral (obligation to return cash) | 0 | 0
Derivative assets, net amount | 0 | 0
Current liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 22,992 | 14,899
Derivative liabilities, gross amounts offset | (3,040) | (4,272)
Derivative liabilities, amounts net of offset | 19,952 | 10,627
Financial collateral (right to reclaim cash) | (19,952) | (10,627)
Derivative liabilities, net amount | 0 | 0
Noncurrent liabilities |  |
Liabilities |  |
Derivative liabilities, gross amounts | 5,143 | 3,568
Derivative liabilities, gross amounts offset | 0 | 0
Derivative liabilities, amounts net of offset | 5,143 | 3,568
Financial collateral (right to reclaim cash) | (5,143) | (3,568)
Derivative liabilities, net amount | $ 0 | $ 0

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