Debt instruments maximum leverage ratio.

No definition available.

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- Definition

Loan maturity period.

+ References

No definition available.

+ Details

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- Definition

Number of note holder accepted the offer.

+ References

No definition available.

+ Details

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- 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

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-Topic 835
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ 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

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date the debt instrument was repurchased, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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Long-Term Debt and Loan Agreements - Additional Information (Details)	1 Months Ended	3 Months Ended					9 Months Ended
	Oct. 31, 2017 USD ($) NoteHolder	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016	May 30, 2014 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity on line of credit			$ 200,000,000				$ 200,000,000
Letters of credit			4,400,000				4,400,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Face value of debt instrument with offer to be repurchased			$ 100,000,000				$ 100,000,000
Senior Unsecured Notes [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument repurchase amount	$ 22,000,000
Debt instrument repurchase date	Oct. 31, 2017
Number of note holder accepted the offer \| NoteHolder	1
Scenario, Forecast [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 1,900,000
Loan Amendment [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity on line of credit									$ 300,000,000
Loan maturity period							2018-12
Maximum leverage ratio			3.50%	3.75%	3.75%
Remaining amount available under the line of credit			$ 135,800,000				$ 135,800,000
Interest rate during period			5.18%			4.65%	5.05%	4.61%
Loan Amendment [Member] \| Extended Maturity [Member]
Debt Instrument [Line Items]
Loan maturity period							2022-03
Loan Amendment [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Maximum leverage ratio		3.25%