Stock Compensation - Restricted Stock and Performance Share Grants - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) award_type
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of types of stock grant awards \| award_type	3
Total compensation cost not yet recognized \| $	$ 6,930
Total compensation cost not yet recognized, period for recognition	24 months

Share Based Compensation Arrangement by Share Based Payment Award, Number of Award Types

No definition available.

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- References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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