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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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

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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

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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Derivatives - Location and Aggregate Fair Value of Interest Rate Swaps (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Jul. 07, 2016
Derivative [Line Items]
Total notional amount		$ 250,000
Effective date	Jul. 07, 2016
Maturity date	Jun. 10, 2023
Unsecured Debt \| London Interbank Offered Rate (LIBOR) \| Interest Rate Swap
Derivative [Line Items]
Effective fixed interest rate (as a percent)	1.07%		2.87%		1.07%
$250 million unsecured term borrowing bearing fixed interest of 2.87%, due June 2023 (5) \| Unsecured Debt \| London Interbank Offered Rate (LIBOR)
Derivative [Line Items]
Effective fixed interest rate (as a percent)			1.07%
Reference rate (as a percent)	1.80%
Carrying Amount \| Recurring basis \| Interest Rate Swap
Derivative [Line Items]
Asset balance (included in Other assets)		$ 20,290		$ 14,693