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Deferred Costs and Other Contract Assets Deferred Costs and Other Contract Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |
Prepaid contract allowances | $ 5,872 |  | $ 5,872 |  | $ 7,036
Deferred commissions | 5,121 |  | 5,121 |  | 5,085
Unbilled contract receivables | 2,396 |  | 2,396 |  | 5,567
Equipment leased to customers, net(1) | 431 |  | 431 |  | 108,417
Total deferred costs and other contract assets | 13,820 |  | 13,820 |  | 126,105
Deferred Cost of Goods Sold, Amortization | 200 | $ 7,400 | 800 | $ 22,200 |
Deferred Cost of Goods Sold, Accumulated Amortization | 1,100 |  | 1,100 |  | $ 103,100
Amortization of Other Deferred Charges | 600 | 500 | 1,800 | 1,300 |
Amortization of Deferred Sales Commissions | $ 500 | $ 500 | $ 1,500 | $ 1,600 |

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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=116634182&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=118932676&loc=d3e3602-108585 + Details
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118261985&loc=d3e55302-109406 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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