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Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Thousands, € in Millions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)
Interest Rate Swap
Derivative
Derivative, Notional Amount	$ 590,000		$ 590,000
Cross Currency Swap
Derivative
Derivative, Notional Amount	402,580		406,546
Effect of Netting Derivative Instruments	(17,000)		$ (12,000)
Net loss included in accumulated other comprehensive income (loss) to be reclassified into interest expense within the next 12 months	1,000
Settlement of Notional Amounts | €		€ (15)
2016 Interest Rate Swaps [Member] | Interest Rate Swap
Derivative
Derivative, Notional Amount	$ 590,000
2016CrossCurrencySwaps [Member] | Cross Currency Swap
Derivative
Derivative, Notional Amount				$ 422,000	€ 400

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

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- Definition

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+ References

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- Definition

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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