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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other investments |  | $ 7,500 | $ 5,300 |
Reclassification of accumulated other comprehensive income due to statutory tax changes | $ 700 |  |  |
Accounting Standards Pending Adoption |  | $ 18,000 |  |
Minimum [Member] |  |  |  |
Useful life |  | 2 years |  |
Maximum [Member] |  |  |  |
Useful life |  | 40 years |  |
Employee Stock Option [Member] |  |  |  |
Number of anti-dilutive securities |  |  |  | 5,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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