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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative assets | $ 9,815 | $ 846

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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Balance Type: | debit
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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. + Details
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Period Type: | duration

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- Details
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