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Accounting for Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments: - Interest rate swaps	Jun. 30, 2016 USD ($)
Notional Disclosures
Notional amount of interest rate swaps	$ 500,000,000
Derivative expiring in 2018
Notional Disclosures
Notional amount of interest rate swaps	300,000,000
Derivative expiring in 2019
Notional Disclosures
Notional amount of interest rate swaps	100,000,000
Derivative expiring in 2020
Notional Disclosures
Notional amount of interest rate swaps	$ 100,000,000

X

- Definition

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

+ References

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

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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X

- Details

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- Details

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