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Basis of Presentation and General Information (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2022 $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2012 $ / shares | Dec. 31, 2021 USD ($) customer segment $ / shares | Jan. 01, 2021 USD ($) customer $ / shares | Dec. 27, 2019 USD ($) customer $ / shares
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Dividend declared | $ / shares |  | $ 0.44 | $ 0.10 | $ 0.40 | $ 0.38 | $ 0.36
Dividends payable nature |  |  |  | During 2021, the Company funded four quarterly dividend payments. |  |
Period of intangible assets amortized |  |  |  | 5 years |  |
Amortization of Intangible Assets |  |  |  | $ 1,016 | $ 977 | $ 1,036
Future amortization expense, 2022 |  | $ 200 |  | 200 |  |
Revenue recognized as a result of change in contract liability |  |  |  | 8,300 | 9,200 |
Deferred commissions |  | $ 1,600 |  | 1,600 | 1,500 |
Commissions expense |  |  |  | $ 1,000 | $ 1,500 |
Number of customers accounted for more than five percent of revenue | customer |  |  |  | 0 | 0 | 0
Number of operating segments | segment |  |  |  | 1 |  |
ASU 2019-12 [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  | Dec. 15, 2020 |  | Dec. 15, 2020 |  |
Change in accounting principle, accounting standards update, adopted |  | true |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  | true |  | true |  |
Minimum [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Useful life of property and equipment |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Useful life of property and equipment |  |  |  | 10 years |  |
Customer contract period |  |  |  | 12 months |  |
Subsequent Event [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Dividend declared | $ / shares | $ 0.44 |  |  |  |  |

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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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