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Revenue Recognition Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 1,937 | $ (329)
Decrease in retained earnings | $ 86,496 | $ 77,338 |  |
Operating income | $ 9,066 | $ 9,210 |  |
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 1,937 | $ (329)

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