Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Capitalized software	$ 4,910	$ 4,479	$ 14,288	$ 13,686
Other definite-lived intangibles	$ 1,136	$ 1,571	$ 3,811	$ 4,716

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.

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