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Basis of Presentation and General Information (Narrative) (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 $ / shares | Dec. 31, 2012 $ / shares | Mar. 31, 2017 USD ($) | Jan. 01, 2016 shares | Dec. 29, 2017 USD ($) customer segment $ / shares shares | Dec. 30, 2016 USD ($) customer $ / shares shares | Jan. 01, 2016 USD ($) customer | Mar. 09, 2018 $ / shares
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  | $ 0 | $ 0 |  |
Dividend declared | $ / shares |  | $ 0.10 |  |  | $ 0.30 | $ 0.26 |  |
Dividend paid | $ / shares | $ 0.10 | $ 0.10 |  |  |  | $ 0.23 |  |
Period of intangible assets amortized |  |  |  |  | 10 years |  |  |
Amortization expense |  |  |  |  | $ 2,090,000 | $ 1,100,000 | $ 2,207,000 |
Future amortization expense, 2018 |  |  |  |  | 2,400,000 |  |  |
Future amortization expense, 2019 |  |  |  |  | 700,000 |  |  |
Future amortization expense, 2020 |  |  |  |  | 600,000 |  |  |
Future amortization expense, 2021 |  |  |  |  | 600,000 |  |  |
Future amortization expense, 2022 |  |  |  |  | 300,000 |  |  |
Future amortization expense, after 2022 |  |  |  |  | $ 700,000 |  |  |
Antidilutive common share equivalents | shares |  |  |  | 0.5 | 0.8 | 0.8 |  |
Number of customers accounted for more than five percent of revenue | customer |  |  |  |  | 0 | 0 | 0 |
Number of operating segments | segment |  |  |  |  | 1 |  |  |
Income tax expense |  |  |  |  | $ 2,884,000 | $ 12,625,000 | $ 7,707,000 |
U.S statutory income tax expense rate |  |  |  |  | 35.00% | 35.00% | 35.00% |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |  |
Income tax expense |  |  | $ 0 |  |  |  |  |
U.S statutory income tax expense rate |  |  |  |  | 34.00% |  |  |
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 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |  |
Dividend declared | $ / shares |  |  |  |  |  |  |  | $ 0.34

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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