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Derivative Instruments - Impact of Netting Agreements and Margin Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Asset derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	$ 315,564	$ 241,952
Liability derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	183,677	139,089
Commodity derivatives
Asset derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	315,564	241,952
Derivative instruments subject to master netting agreements	(104,559)	(86,856)
Margin deposits remitted to counterparties	0	0
Derivative instruments, net	211,005	155,096
Liability derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	183,677	139,089
Derivative instruments subject to master netting agreements	(104,559)	(86,856)
Margin deposits remitted to counterparties	(11,110)	0
Derivative instruments, net	$ 68,008	$ 52,233

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