Income Taxes - Change in Valuation Allowance (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, December 31, 2016	$ (70,203)
Reductions - Section 382	66,226
Increases - current year	(5,822)
Reductions - tax rate change	3,279
Balance, December 31, 2017	$ (6,520)

Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Change in Enacted Tax Rate

No definition available.

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- Definition

Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Current Period

+ References

No definition available.

+ Details

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- Definition

Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Operating Loss Carryforwards

+ References

No definition available.

+ Details

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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