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

Represents floor rate.

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No definition available.

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Balance Type:	na
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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

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

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.

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No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

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Balance Type:	credit
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

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- Definition

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

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The carrying value as of the balance sheet date of the noncurrent portion 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 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600

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Debt (Detail Textuals) - USD ($) $ in Thousands	6 Months Ended
Debt (Detail Textuals) - USD ($) $ in Thousands	Dec. 31, 2017	Jul. 31, 2017	Jun. 30, 2017
Debt Instrument [Line Items]
Revolving credit facility	$ 71,000		$ 65,000
Interest rate swap
Debt Instrument [Line Items]
Percentage of interest rate		1.8325%
Derivative, notional amount		$ 150,000
Credit agreement (the "Credit Agreement") \| Revolving credit facility (the "Revolver")
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000
Revolving credit facility	71,000
Outstanding letters of credit	4,606
Aggregate available credit facilities	$ 174,394
Weighted-average interest rates	3.01%
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| LIBOR
Debt Instrument [Line Items]
Interest rate, description	2.00%, 1.75% or 1.50%
Floor rate	0.00%
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| Eurodollar
Debt Instrument [Line Items]
Interest rate, description	2.00%, 1.75% or 1.50%
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| Base Rate
Debt Instrument [Line Items]
Interest rate, description	1.00%, 0.75% or 0.50%
Credit agreement (the "Credit Agreement") \| Term A Loan
Debt Instrument [Line Items]
Aggregate principal amount	$ 250,000
Weighted-average interest rates	3.29%