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Income Taxes - Changes in The Valuation Allowance (Details) - Deferred Tax Assets Valuation Allowance [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Income Taxes Changes in Valuation Allowance [Abstract] |  |
Balance at beginning of year | $ 5,495 |
Charged to costs and expenses | $ (5,495) | [1]
[1] | Of the 2017 amount charged to costs and expenses, $1.8 million primarily relates to the reduction in the tax rate used to compute the valuation allowance as a result of the Tax Cuts and Jobs Act.

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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