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Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accounting Standards Update 2016-01 [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 0 |
Accounting Standards Update 2016-09 [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 67
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (157) |
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | (117)
Common Stock [Member] | Accounting Standards Update 2016-09 [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 184

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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