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

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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Fair Value Measurements, Assets and Liabilities Measured on Non-Recurring Basis, Gain (Loss)

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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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.

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- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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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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Fair Value Measurements - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives Fair Value
Loss to be reclassified during next 12 months	$ 200,000
Nonrecurring
Derivatives Fair Value
Assets and liabilities measured at FV on a non-recurring basis	0	$ 0
Interest rate swap \| Interest Expense
Derivatives Fair Value
Ineffectiveness recorded in interest expense	$ 300,000	0	$ 0
LIBOR \| Interest rate swap
Derivatives Fair Value
Derivative interest rate	1.00%
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swap
Derivatives Fair Value
Derivative, average fixed interest rate	2.151%
Notional amounts of the forward contracts	$ 700,000,000	$ 700,000,000