Fair Value of Financial Instruments (Schedule of Interest Rate Swaps) (Details)	6 Months Ended
Jun. 30, 2018 USD ($)
Interest Rate Swaps One [Member]
Derivative [Line Items]
Notional Amount, Asset	$ 400,000,000
Fixed Interest Rate	1.882%
Termination Date	Aug. 30, 2019
Fair Value of Asset	$ 3,000,000
Interest Rate Swaps Two [Member]
Derivative [Line Items]
Notional Amount, Asset	$ 200,000,000
Fixed Interest Rate	2.515%
Termination Date	Aug. 30, 2019
Fair Value of Asset
Interest Rate Swaps Three [Member]
Derivative [Line Items]
Notional Amount, Liability	$ 200,000,000
Fixed Interest Rate	2.613%
Termination Date	Aug. 30, 2019
Fair Value of Liability
Interest Rate Swaps Four [Member]
Derivative [Line Items]
Notional Amount, Asset	$ 300,000,000
Fixed Interest Rate	2.041%
Termination Date	Aug. 30, 2020
Fair Value of Asset	$ 5,000,000
Interest Rate Swaps Five [Member]
Derivative [Line Items]
Notional Amount, Liability	$ 300,000,000
Fixed Interest Rate	2.738%
Termination Date	Aug. 30, 2020
Fair Value of Liability
Interest Rate Swaps Six [Member]
Derivative [Line Items]
Notional Amount, Liability	$ 300,000,000
Fixed Interest Rate	2.892%
Termination Date	Aug. 30, 2020
Fair Value of Liability	$ (1,000,000)
Interest Rate Swaps Seven [Member]
Derivative [Line Items]
Notional Amount, Asset	$ 300,000,000
Fixed Interest Rate	2.363%
Termination Date	Jan. 27, 2021
Fair Value of Asset	$ 3,000,000
Interest Rate Swaps Eight [Member]
Derivative [Line Items]
Notional Amount, Asset	$ 200,000,000
Fixed Interest Rate	2.368%
Termination Date	Jan. 27, 2021
Fair Value of Asset	$ 3,000,000

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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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.

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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