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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Accounting Standards Update 2014-09 [Member] |  |
Effect of adoption | $ 53 | $ 239,000
Effect of adoption, tax | $ 186 | 53,000
Cumulative effect of new accounting principle in period of adoption |  | 186,000
Accounting Standards Update 2016-02 [Member] |  |
Adjustment |  | 449,000
Accounting Standards Update 2018-02 [Member] |  |
Adjustment |  | $ 53,000

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