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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 29, 2016 | Aug. 15, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  | $ (17,200) |  |  |  |  |
Qualifying Assets Placed In Service, Expensed | $ 2,900 |  |  |  |  |  |
Unrecognized tax benefits | 0 | 0 | $ 0 |  |  | $ 814 | $ 515
Increase (Decrease) To Deferred Tax Liability, Re-measurement Upon Completion Of Tax Examination |  |  |  | $ 600 |  |  |
State |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards | $ 36,400 | $ 36,400 |  |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  | $ 600 | $ 200 |  |

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- Definition Amount of operating loss 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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