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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Dec. 22, 2017	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract]
U.S. Federal statutory tax rate	35.00%		34.00%	34.00%	34.00%
Tax benefit related to remeasurement			$ (15.2)
Valuation allowance offset to remeasurement tax benefit			$ 15.2
Scenario, Forecast [Member]
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract]
U.S. Federal statutory tax rate		21.00%

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- Definition

n/a

+ References

No definition available.

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Amount of reasonable estimate for the increase (decrease) in income tax expense (benefit) attributable to the increase (decrease) in the valuation allowance for remeasurement of deferred tax from change in tax rate pursuant to the Tax Cut And Jobs Act of 2017 for which accounting is incomplete.

+ References

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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No definition available.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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