v3.8.0.1

Debt (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) bank	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Debt outstanding	$ 0	$ 0
Number of banks to which the Company is party to a credit agreement | bank	2
Calculated maximum borrowings	$ 150,000,000.0
Available increase in borrowings under credit agreement	100,000,000.0
Outstanding borrowings	0
Letters of credit outstanding	1,300,000
Remaining borrowing capacity	148,700,000
Total interest paid	200,000	200,000	$ 300,000
Total interest capitalized	$ 0	$ 0	$ 0
Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Percentage of commitment fee	0.15%
Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Percentage of commitment fee	0.30%
Credit Agreement Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.875%
Credit Agreement Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.75%
Credit Agreement Interest Rate Option Two | Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on base rate	0.00%
Credit Agreement Interest Rate Option Two | Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on base rate	0.25%
Credit Agreement Interest Rate Option Two | London Interbank Offered Rate (LIBOR) | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.00%
Credit Agreement Interest Rate Option Two | Federal Funds Rate | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.50%

X

- Definition

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

+ References

No definition available.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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-Section S99
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- Definition

The amount of cash paid during the current period for interest that is capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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X

- 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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X

- 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))
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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
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-Name Accounting Standards Codification
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-Section S99
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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- Definition

Debt instrument basis spread on base rate.

+ References

No definition available.

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X

- Definition

An Accordion, also called an Option, gives the Borrower the right to increase a credit facility up to a certain amount as defined in the credit agreement without getting further approval from existing lenders. The incremental dollars may be provided by the existing Lenders or new Lenders.

+ References

No definition available.

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X

- Definition

Number of lender banks in credit agreement.

+ References

No definition available.

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