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Stock-Based Compensation (Stock-based Compensation Expense) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Share-based Compensation [Abstract]
2019	$ 3,577
2020	3,388
2021	1,674
2022	179
2023	0
Total	$ 8,818

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- Definition

Future Share-based Compensation Expense, Remainder of Current Year

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- Definition

Future Share-based Compensation Expense, Year Four

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- Definition

Future Share-based Compensation Expense, Year One

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- Definition

Future Share-based Compensation Expense, Year Three

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- Definition

Future Share-based Compensation Expense, Year Two

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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