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Derivative Instruments and Hedging Activities - Interest Rate Swaps Designated as Hedging Instruments Included in Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Interest Expense	$ 19,752	$ 13,918
Derivatives Designated as Hedging Instruments | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Interest Expense	$ 0	$ (27)

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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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- Definition

The net amount of operating interest income (expense).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.10)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Details

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- Details

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