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Financial Instruments - Summary of Outstanding Interest Rate Swap Agreement (Details) - Interest rate swap - Cash Flow Hedging $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative contract term (years)	3 years
Aggregate Notional Amount	$ 350.0
LIBOR
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Spread on receive rate	1.75%
Receive Rate as of December 31, 2017	3.30%
Pay Rate	3.50%

X

- Definition

Interest Rate Derivatives, Pay Rate

+ References

No definition available.

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- Definition

Interest Rate Derivatives, Receive Rate

+ References

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+ Details

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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

+ Details

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X

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

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+ Details

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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

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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