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

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

Reference 2: 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(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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- 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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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

+ Details

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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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Period Type:	instant

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- Details

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Long-Term Debt and Loan Agreements - Additional Information (Details) - USD ($)	3 Months Ended					6 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	May 30, 2014
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
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	3.25%		3.75%	3.75%
Remaining amount available under the line of credit			$ 123,600,000			$ 123,600,000
Interest rate during period			4.87%		4.51%	4.99%	4.58%
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		3.50%