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Fair Value Measurement - Change in Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Level 3 $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance December 31, 2017	$ 34,338
(Loss) Gain included in earnings:
Unrealized losses, net	(37,679)
Realized gains, net	129,935
Included in other comprehensive income	12,336
Settlements	10,384
Reclassification upon conversion of Series A Preferred Stock	(140,319)
Currency translation adjustment and other	(1,301)
Balance June 30, 2018	7,694
Unrealized loss, net, relating to derivatives held at June 30, 2018	$ (37,679)

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- Definition

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Foreign Currency Translation Adjustments

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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [Abstract]

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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Preferred Stock Conversion Reclassification

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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