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Income Taxes - Summary of Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	$ 97,072
United States [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	74,613
Canada [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	$ 22,459

X

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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