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Commitments and Contingencies - Contingencies (Details) - Pending Litigation - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities Litigation Case
Commitments and Contingencies
Loss contingency accrual		$ 0
Heckermann Montross Suit
Commitments and Contingencies
Loss contingency accrual	$ 0	$ 0

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- Definition

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+ References

No definition available.

+ Details

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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