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Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - Accounting Standards Update 2016-09 [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 67
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ 22 | $ 1,300 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share |  | $ 0.02 |
Retained Earnings [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | (117)
Common Stock [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 184

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