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Income Tax Matters Income Tax Matters Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |
Operating Loss Carryforwards | $ 117,700,000 | $ 117,700,000 |  |  |
Tax Credit Carryforward, Amount | 11,400,000 | 11,400,000 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | (4,600,000) | $ (2,700,000) | $ (5,500,000) |
Unrecognized Tax Benefits | 1,500,000 | 1,500,000 | 1,500,000 | 1,800,000 | $ 1,700,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 400,000 | 400,000 |  |  |
Accrued interest and penalties on unrecognized tax benefits | 200,000 | 200,000 | 100,000 |  |
Accrued interest and penalties on unrecognized tax benefits, current | 0 | 0 |  |  |
(Decrease) increase in interest and penalty | (100,000) | (100,000) |  | $ 0 |
Provisional decrease in deferred tax assets |  |  | $ 29,000,000.0 |  |
Provisional Transition Tax obligation | 3,500,000 |  |  |  |
Accrued witholding taxes due to Canadian earnings deemed no longer permanently reinvested | 1,600,000 | 1,600,000 |  |  |
Provisional Section 162(m) obligation | $ 2,300,000 | $ 2,300,000 |  |  |

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete, classified as noncurrent. + References No definition available. + Details
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- Definition The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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