Stock-Based Compensation - Management Stock Purchase Plan (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Management Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum cash compensation allowed towards purchase of stock, percent	20.00%
Maximum cash compensation allowed towards purchase of stock, amount	$ 200
Requisite service period	2 years
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of shares granted as a result of satisfying requisite period	50.00%

Maximum Amount Of Cash Compensation Allowed Towards Purchase Of Stock, Amount

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- Definition

Maximum Amount Of Cash Compensation Allowed Towards Purchase Of Stock, Percent

+ References

No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Granted As A Result Of Satisfying Requisite Period, Percent

+ References

No definition available.

+ Details

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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