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Fair Value (Details) - USD ($)
$ in Thousands

Mar. 31, 2019

Dec. 31, 2018

Assets

Derivatives

$ 94,769

$ 233,629

Liabilities

Derivatives

108,601

75,349

Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Assets

Derivatives

0

^[1]

0

^[2]

Liabilities

Derivatives

0

^[1]

0

^[2]

Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Assets

Derivatives

94,769

^[1]

233,629

^[2]

Liabilities

Derivatives

108,601

^[1]

75,349

^[2]

Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

Assets

Derivatives

0

^[1]

0

^[2]

Liabilities

Derivatives

$ 0

^[1]

$ 0

^[2]

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