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Income Taxes (Additional Disclosures) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2015 filing_group | Dec. 31, 2014 filing_group | Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |
Provisional expense for the effects of the 2017 Tax Act | $ 7,300,000 |  |  |
Provisional expense for remeasurement of net deferred tax assets for the effects of the 2017 Tax Act | 5,500,000 |  |  |
Provisional expense for unrepatriated earnings from foreign subsidiaries for the effects of the 2017 Tax Act | 200,000 |  |  |
Provisional expense for limitations on the deductibility of executive compensation for the effects of the 2017 Tax Act | 1,600,000 |  |  |
Unrecognized tax benefits | 0 |  |  |
Net operating loss carryforwards | 103,800,000 |  |  |
Number of U.S. tax return filing groups | filing_group |  | 1 | 2 |
Valuation allowance | 1,187,000 |  |  | $ 1,053,000
Unremitted earnings outside the US | $ 1,500,000 |  |  |

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