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Income Taxes (Deferred Tax Assets Expiration) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Operating Loss Carryforwards [Line Items] |
Total deferred tax assets | $ 3,523
2026 - 2030 [Member] |
Operating Loss Carryforwards [Line Items] |
Total deferred tax assets | 1,038
2031 - 2037 [Member] |
Operating Loss Carryforwards [Line Items] |
Total deferred tax assets | 2,485
No Expiration [Member] |
Operating Loss Carryforwards [Line Items] |
Total deferred tax assets | $ 0

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