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Revenue Recognition Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (329,000) | $ (178,000) | $ 1,900,000 |
Deferred revenue | 700,000 |  |  | $ 700,000
Deferred expenses | 300,000 |  |  | 400,000
Decrease in retained earnings | 77,338,000 | 71,453,000 |  |
Operating income | 9,210,000 | $ 9,936,000 |  |
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | (329,000) |  |  |
Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in retained earnings |  |  |  | $ 300,000
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income | $ 9,270,000 |  |  |

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