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Other net losses Other Losses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event [Line Items]
Acquisition and transition-related costs		$ (3,116)	$ (445)	$ (3,142)	$ (2,389)
Tax reform		(11,728)	0	(11,728)	0
Management succession and executive retirement		(6,952)	0	(6,952)	0
Other (c)		(5,144)	(5,358)	(6,008)	(5,978)
Other losses		$ (26,940)	$ (5,803)	$ (27,830)	$ (8,367)
Subsequent Event
Subsequent Event [Line Items]
Period for refund of taxes collected at the higher rate	5 years

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Management Succession and Executive Retirement Expense

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Other Nonoperating Expense, Refund of Excess Taxes Collected

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Period for Repayment of Excess Amounts Collected for Taxes

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of expense related to nonoperating activities, classified as other.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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