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

No definition available.

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- Definition

Maximum amount of additional loans that may be issued under the accordion feature of the debt agreement subject to receipt of lender commitments and satisfaction of certain customary conditions.

+ References

No definition available.

+ Details

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- Definition

Represents the fixed interest rate on the derivative for a future period.

+ References

No definition available.

+ Details

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- Definition

Representing fixed charge coverage ratio.

+ References

No definition available.

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- Definition

The length of time the company can extend the maturity date on the debt revolver.

+ References

No definition available.

+ Details

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- Definition

The increase in the maximum borrowing capacity under the credit facility upon exercise of the accordion feature which is subject to receipt of lender commitments and satisfaction of certain customary conditions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The number of periods the company can extend the maturity date of the debt revolver.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents the unsecured leverage ratio that must be maintained as a part of the debt agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the leverage ratio for a significant acquisition in a short period of time.

+ References

No definition available.

+ Details

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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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Period Type:	instant

- 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

No definition available.

+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, 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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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Period Type:	instant

- Definition

Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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Bank Note Payable, Term Note Payable and Private Placements (Details)					12 Months Ended
	Oct. 24, 2017 USD ($)	Jul. 22, 2016	Aug. 26, 2013	Sep. 27, 2012 USD ($)	Dec. 31, 2017 USD ($) period	Dec. 31, 2016 USD ($)	Oct. 18, 2017 USD ($)	Jul. 21, 2016 USD ($)
Debt Instrument [Line Items]
Borrowings outstanding					$ 78,000,000	$ 280,000,000
Amount drawn down						$ 150,000,000
Senior Notes
Debt Instrument [Line Items]
Principal amount of loan	$ 200,000,000
Fixed charge coverage ratio	1.50
Series A Notes
Debt Instrument [Line Items]
Principal amount of loan	$ 116,000,000
Interest rate (as a percent)	3.99%
Series B Notes
Debt Instrument [Line Items]
Principal amount of loan	$ 84,000,000
Interest rate (as a percent)	4.26%
Maximum \| Senior Notes
Debt Instrument [Line Items]
Unsecured leverage ratio	60.00%
Unsecured leverage ratio for significant acquisition	65.00%
BAML Credit Facility \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.50%
BAML Credit Facility \| One month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%
BAML Revolver
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)					2.31%	1.88%
Effective interest rate (as a percent)					2.63%
Total available					$ 600,000,000
Number of periods of extension \| period					2
Length of extension period					6 months
Additional borrowing capacity allowed by exercising an accordion feature					$ 500,000,000
Borrowings outstanding					$ 78,000,000	$ 280,000,000
Facility fee at period end (as a percent)					0.25%
BAML Revolver \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Facility fee (as a percent)					0.125%
BAML Revolver \| BBB+ \| Baa1
Debt Instrument [Line Items]
Facility fee (as a percent)					0.15%
BAML Revolver \| BBB \| Baa2
Debt Instrument [Line Items]
Facility fee (as a percent)					0.20%
BAML Revolver \| BBB- \| Baa3
Debt Instrument [Line Items]
Facility fee (as a percent)					0.25%
BAML Revolver \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Facility fee (as a percent)					0.30%
BAML Revolver \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					1.20%
BAML Revolver \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.825%
BAML Revolver \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.875%
BAML Revolver \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%
BAML Revolver \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.20%
BAML Revolver \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.55%
BAML Revolver \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					0.20%
BAML Revolver \| Base Rate \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.00%
BAML Revolver \| Base Rate \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.00%
BAML Revolver \| Base Rate \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.00%
BAML Revolver \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.20%
BAML Revolver \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.55%
BAML Term Loan
Debt Instrument [Line Items]
Principal amount of loan					$ 400,000,000
Weighted average interest rate (as a percent)					2.47%
Additional borrowing capacity allowed by exercising an accordion feature					$ 500,000,000
Amount drawn down				$ 400,000,000
BAML Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					1.35%
Fixed rate (as a percent)				0.75%
Term pursuant to interest rate swap agreement				5 years
Future fixed interest rate		1.12%
BAML Term Loan \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.90%
BAML Term Loan \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.95%
BAML Term Loan \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.10%
BAML Term Loan \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.35%
BAML Term Loan \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.75%
BAML Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					0.35%
BAML Term Loan \| Base Rate \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.00%
BAML Term Loan \| Base Rate \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.00%
BAML Term Loan \| Base Rate \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.10%
BAML Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.35%
BAML Term Loan \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.75%
JPM Term Loan
Debt Instrument [Line Items]
Principal amount of loan							$ 150,000,000
Term of the borrowing					2 years
Interest rate during period (as a percent)					2.98%
Weighted average interest rate (as a percent)					2.45%	1.99%
JPM Term Loan \| Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					1.35%
JPM Term Loan \| Eurodollar Rate \| BBB \| Baa2 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.10%
JPM Term Loan \| Eurodollar Rate \| BBB \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.85%
JPM Term Loan \| Eurodollar Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.35%
JPM Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%
JPM Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					35.00%
JPM Term Loan \| Base Rate \| BBB \| Baa2 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.10%
JPM Term Loan \| Base Rate \| BBB \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.85%
JPM Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.35%
JPM Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.50%
BMO Term Loan
Debt Instrument [Line Items]
Principal amount of loan					$ 220,000,000
Additional loans allowed by exercising an accordion feature								$ 50,000,000
Effective interest rate (as a percent)					3.97%
BMO Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)						1.65%
Fixed rate (as a percent)					2.32%
Term pursuant to interest rate swap agreement			7 years
BMO Term Loan \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.05%
BMO Term Loan \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.15%
BMO Term Loan \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.35%
BMO Term Loan \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.65%
BMO Term Loan \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					2.15%
BMO Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)					0.65%
BMO Term Loan \| Base Rate \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.05%
BMO Term Loan \| Base Rate \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.15%
BMO Term Loan \| Base Rate \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.35%
BMO Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.65%
BMO Term Loan \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.15%
BMO Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.50%
BMO Term Loan \| One month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%