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Debt (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) lease	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Debt
Number of capital lease obligations | lease	2
Capital lease obligations, term	4 years
Capital lease obligations	$ 4,362,000		$ 0
Current portion of the outstanding liability	1,000,000
Capital lease obligation - net of current portion	$ 2,900,000
Minimum
Debt
Capital lease obligations, Interest Rate, Stated Percentage	2.89%
Maximum
Debt
Capital lease obligations, Interest Rate, Stated Percentage	3.50%
Revolving Credit Facility | Base Rate
Debt
Credit facility, interest rate basis	base rate
Line of Credit
Debt
Credit facility, total available credit	$ 304,000,000
Revolving Credit Facility
Debt
Credit facility, total available credit	300,000,000
Credit facility, unused borrowing capacity	4,000,000
Line of credit and notes payable	$ 0	$ 0	$ 0
Revolving Credit Facility | Minimum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.15%
Interest rate during period	0.47%
Revolving Credit Facility | Maximum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.30%
Interest rate during period	8.25%
Revolving Credit Facility | LIBOR
Debt
LIBOR rate	1.23%
Credit facility, interest rate basis	LIBOR
Revolving Credit Facility | LIBOR | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.60%
Revolving Credit Facility | LIBOR | Maximum
Debt
Credit facility, interest rate spread (as a percent)	1.45%
Revolving Credit Facility | Base Rate | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.00%
Revolving Credit Facility | Base Rate | Maximum
Debt
Credit facility, interest rate spread (as a percent)	0.45%

X

- Definition

Capital Lease Obligations, Term

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Number of Capital Lease Obligations

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- Definition

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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- 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

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.

+ References

No definition available.

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- Definition

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

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

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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The effective interest rate during the reporting period.

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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, 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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