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Fair Value Measurements - Derivative Instrument Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Derivative instruments, at fair value	$ 315,564	$ 241,952
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1)
Assets
Derivative instruments, at fair value	7,661	0
Liabilities
Derivative instruments, at fair value	12,058	0
Fair value on a recurring basis | Significant other observable inputs (Level 2)
Assets
Derivative instruments, at fair value	307,903	241,952
Liabilities
Derivative instruments, at fair value	171,619	139,089
Fair value on a recurring basis | Significant unobservable inputs (Level 3)
Assets
Derivative instruments, at fair value	0	0
Liabilities
Derivative instruments, at fair value	0	0
Fair value on a recurring basis | Fair value
Assets
Derivative instruments, at fair value	315,564	241,952
Liabilities
Derivative instruments, at fair value	$ 183,677	$ 139,089

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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