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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- References

No definition available.

+ Details

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(b),(c)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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Risk Management and Use of Derivative Financial Instruments (Details 7) € in Thousands, ¥ in Thousands, NOK in Thousands, $ in Thousands	Jun. 30, 2016 USD ($) instrument	Jun. 30, 2016 NOK instrument	Jun. 30, 2016 EUR (€) instrument	Jun. 30, 2016 JPY (¥) instrument
Derivative Instrument Detail
Fair value, foreign currency derivatives	$ 35,136
Designated as hedging \| Cash Flow Hedging \| Foreign currency contract \| Euro
Derivative Instrument Detail
Derivative number of instruments \| instrument	70	70	70	70
Derivative notional amount \| €			€ 139,237
Fair value, foreign currency derivatives	$ 32,285
Designated as hedging \| Cash Flow Hedging \| Foreign currency contract \| NOK
Derivative Instrument Detail
Derivative number of instruments \| instrument	15	15	15	15
Derivative notional amount \| NOK		NOK 10,819
Fair value, foreign currency derivatives	$ 174
Designated as hedging \| Cash Flow Hedging \| Foreign currency zero-cost collars \| Euro
Derivative Instrument Detail
Derivative number of instruments \| instrument	2	2	2	2
Derivative notional amount \| €			€ 15,100
Fair value, foreign currency derivatives	$ 42
Designated as hedging \| Cash Flow Hedging \| Foreign currency zero-cost collars \| NOK
Derivative Instrument Detail
Derivative number of instruments \| instrument	3	3	3	3
Derivative notional amount \| NOK		NOK 2,000
Fair value, foreign currency derivatives	$ (5)
Designated as hedging \| Net Investment Hedging \| Foreign currency contract \| NOK
Derivative Instrument Detail
Derivative number of instruments \| instrument	4	4	4	4
Derivative notional amount \| NOK		NOK 6,090
Fair value, foreign currency derivatives	$ 100
Designated as hedging \| Net Investment Hedging \| Foreign currency contract \| JPY
Derivative Instrument Detail
Derivative number of instruments \| instrument	7	7	7	7
Derivative notional amount \| ¥				¥ 896,148
Fair value, foreign currency derivatives	$ 2,546
Designated as hedging \| Net Investment Hedging \| Foreign currency zero-cost collars \| NOK
Derivative Instrument Detail
Derivative number of instruments \| instrument	1	1	1	1
Derivative notional amount \| NOK		NOK 2,500
Fair value, foreign currency derivatives	$ (6)