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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other investments |  | $ 5,300 | $ 3,100 |
Reclassification of accumulated other comprehensive income due to statutory tax changes | $ 700 |  |  |
Minimum [Member] |  |  |  |
Useful life |  | 2 years |  |
Maximum [Member] |  |  |  |
Useful life |  | 40 years |  |
Employee Stock Option [Member] |  |  |  |
Number of anti-dilutive securities |  |  | 5,000 | 50,000

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