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Debt - Narratives (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 10, 2015	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	May 23, 2016	May 22, 2016
Line of Credit Facility
Line of credit maximum borrowing amount		$ 300,000,000		$ 300,000,000
Debt amortization expense		46,000	$ 46,000	93,000	$ 0
Long-term Line of Credit, Noncurrent		57,000,000		$ 57,000,000		$ 76,300,000
Line of Credit | Revolving Credit Facility Due 2020
Line of Credit Facility
Debt instrument, term	5 years
Line of credit maximum borrowing amount	$ 200,000,000					$ 300,000,000	$ 300,000,000	$ 200,000,000
Line of credit facility contingent increase to maximum borrowing capacity							$ 100,000,000
Commitment fee percentage per annum				0.25%		0.25%
Long-term Line of Credit, Noncurrent		$ 57,000,000		$ 57,000,000		$ 76,300,000
Line of Credit | Revolving Credit Facility Due 2020 Swingline Sublimit
Line of Credit Facility
Line of credit maximum borrowing amount	15,000,000
Line of Credit | Revolving Credit Facility Due 2020 Letter Of Credit Sublimit
Line of Credit Facility
Line of credit maximum borrowing amount	$ 10,000,000
Minimum | Line of Credit | Revolving Credit Facility Due 2020
Line of Credit Facility
Commitment fee percentage per annum	0.20%
Maximum | Line of Credit | Revolving Credit Facility Due 2020
Line of Credit Facility
Commitment fee percentage per annum	0.40%

X

- Definition

Increased maximum borrowing capacity under the credit facility if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

+ References

No definition available.

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X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(8))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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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.

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- 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.

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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.

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- 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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X

- Definition

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)
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