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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Projected income tax benefit |  | $ 3,334,000 |  |
Estimated foreign earnings and profits tax expense | $ 10,100,000 | 13,104,000 |  |
Current foreign earnings and profits tax liability | 1,048,000 | $ 1,048,000 |  |
Federal statutory percentage rate |  | 35.00% | 35.00% | 35.00%
Additional unrecognized tax benefit that would affect our annual effective tax rate | 234,000 | $ 234,000 | $ 235,000 |
Withholding taxes | 2,540,000 | $ 2,540,000 |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal statutory percentage rate |  | 35.00% |  |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards with unlimited carryforward period | 10,680,000 | $ 10,680,000 |  |
Net operating loss carryforwards expiring in 2035 | 3,759,000 | 3,759,000 |  |
Valuation allowance release in Canada related to restructuring |  | 147,000 |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | $ 4,602,000 | $ 4,602,000 |  |

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