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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments (Details) - Interest rate swaps - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Variation margin payable	$ 4,400	$ 4,400
Variation margin receivable	9,300	9,300
Trading
Derivative [Line Items]
Derivative assets	$ 10,543	$ 10,101

X

- Definition

Derivative Instruments, Variation Margin Payable

+ References

No definition available.

+ Details

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X

- Definition

Derivative Instruments, Variation Margin Receivable

+ References

No definition available.

+ Details

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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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.

+ References

No definition available.

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- Details

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- Details

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