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Debt (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) lease	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt
Capital lease obligations	$ 3,750,000	$ 0	$ 0
Outstanding liability	1,100,000
Long-term portion	2,600,000
Amount of interest costs incurred, capitalized, and expensed
Interest costs incurred	1,249,000	1,167,000	1,133,000
Less: Interest capitalized	(72,000)	(20,000)	(136,000)
Interest expense	$ 1,177,000	$ 1,147,000	997,000
Base rate
Debt
Credit facility, interest rate basis	base rate
Line of credit
Debt
Credit facility, total available credit	$ 304,200,000
Primary Revolving Credit Facility
Debt
Credit facility, total available credit	300,000,000
Credit facility, remaining borrowing capacity	4,000,000
Total outstanding balances	$ 0		$ 0
Primary Revolving Credit Facility | Minimum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.15%
Debt Instrument, Interest Rate, Stated Percentage	0.471%
Primary Revolving Credit Facility | Maximum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.30%
Debt Instrument, Interest Rate, Stated Percentage	8.50%
Primary Revolving Credit Facility | LIBOR
Debt
LIBOR Rate	1.49%
Primary Revolving Credit Facility | LIBOR | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.60%
Primary Revolving Credit Facility | LIBOR | Maximum
Debt
Credit facility, interest rate spread (as a percent)	1.45%
Primary Revolving Credit Facility | Base rate | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.00%
Primary Revolving Credit Facility | Base rate | Maximum
Debt
Credit facility, interest rate spread (as a percent)	0.45%
Cisco Systems Capital Corporation
Debt
Number of Capital Lease Obligations | lease	2
Capital Lease Obligations, Term	4 years
Capital lease obligations	$ 4,400,000
Cisco Systems Capital Corporation | Minimum
Debt
Debt Instrument, Interest Rate, Stated Percentage	2.89%
Cisco Systems Capital Corporation | Maximum
Debt
Debt Instrument, Interest Rate, Stated Percentage	3.50%

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- Definition

Capital Lease Obligations, Term

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The reference rate of the variable rate debt instrument at the end of the reporting period.

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Number of Capital Lease Obligations

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of interest capitalized during the period.

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-Topic 835
-SubTopic 20
-Section 50
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Total interest costs incurred during the period and either capitalized or charged against earnings.

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

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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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

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