Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Jul. 31, 2018 USD ($)	Jul. 31, 2018 NOK (kr)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 NOK (kr)	Jun. 30, 2018 EUR (€)
Foreign currency forward contracts
Derivative [Line Items]
Fair Value / Carrying Amount of Asset (Liability) Non-hedge			$ (2,362)
Expected Maturity, 2018			39,044
Expected Maturity, 2019			31,825
Foreign currency forward contracts \| Norwegian Kroner
Derivative [Line Items]
Contract Amount in Foreign Currency \| kr				kr 500,000,000
Fair Value / Carrying Amount of Asset (Liability) Non-hedge			$ (2,062)
Average Forward Rate			7.86	7.86	7.86
Expected Maturity, 2018			$ 31,764
Expected Maturity, 2019			31,825
Foreign currency forward contracts \| Euro
Derivative [Line Items]
Contract Amount in Foreign Currency \| €					€ 6,000,000
Fair Value / Carrying Amount of Asset (Liability) Non-hedge			$ (300)
Average Forward Rate			0.82	0.82	0.82
Expected Maturity, 2018			$ 7,280
NIBOR \| Cross currency swaps
Derivative [Line Items]
Contract Amount in Foreign Currency			162,200	kr 1,000,000,000
Fair Value / Carrying Amount of Asset (Liability) Non-hedge			$ (42,118)
Subsequent Event \| NIBOR \| 4.25% Margin \| Cross currency swaps
Derivative [Line Items]
Contract Amount in Foreign Currency	$ 146,800	kr 905,000,000