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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 47,772		$ 47,772
Amortization of intangible assets	$ 2,100	$ 0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful lives	12 years
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Useful lives	4 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Useful lives	3 years
Favorable leasehold interest
Finite-Lived Intangible Assets [Line Items]
Useful lives	12 years