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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Provision for doubtful accounts | $ 200 |  | $ 681 | $ 168 |
Allowance for doubtful accounts | $ 800 |  | $ 800 |  | $ 1,000
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  | true |  |
Accounting Standards Update 2017-04 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  | true |  |
Accounting Standards Update 2018-15 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  | true |  |
Stock Options [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of potential diluted securities outstanding | 523,000 | 650,000 | 523,000 | 650,000 |
Number of securities included in calculation of diluted earnings per share | 301,000 | 359,000 | 303,000 | 335,000 |
Restricted Stock [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of potential diluted securities outstanding | 149,000 | 147,000 | 149,000 | 147,000 |
Number of securities included in calculation of diluted earnings per share | 38,000 | 78,000 | 58,000 | 81,000 |

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