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Debt - Schedule of Amounts Borrowed Under Wells Fargo Revolving Credit Agreement (Details) - Wells Fargo Credit Agreement - Wells Fargo Revolving Credit Facility - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2017
Line of Credit Facility [Line Items]
Average borrowings under Wells Fargo Revolving Credit Facility	$ 26,662	$ 44,335	$ 96,390	$ 53,250
Average Interest Cost on Wells Fargo Revolving Credit Facility	6.85%	2.75%	1.96%	2.36%
Accrued and unpaid interest	$ 90	$ 24	$ 86	$ 105
Available revolving line of credit balance	$ 13,000				$ 40,000
Prime Rate
Line of Credit Facility [Line Items]
Wells Fargo Prime Rate (Base Rate) loan interest rate	6.00%	4.25%	3.50%	3.25%
LIBOR
Line of Credit Facility [Line Items]
LIBOR loan interest rate	4.51%	2.71%	1.84%	1.66%

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- Definition

Line Of Credit Facility, Average Interest Rate

+ References

No definition available.

+ Details

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

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- Definition

Increase for accrued, but unpaid interest on the credit facility for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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- Definition

The effective interest rate at the end of the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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