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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Asset derivatives, gross amounts presented in the consolidated balance sheet | $ 28,226 | $ 12,603
Asset derivatives, gross amounts not offset in the consolidated balance sheet subject to netting agreements | (1,073) | (292)
Asset derivatives, net amount | 27,153 | 12,311
Liability derivatives, gross amounts presented in the consolidated balance sheet | 1,639 | 16,694
Liability derivatives, gross amounts not offset in the consolidated balance sheet subject to netting agreements | (1,073) | (292)
Liability derivatives, net amount | $ 566 | $ 16,402

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