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Other net losses Other Losses (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 01, 2020	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Acquisition and transition-related costs		$ 14,104	$ 11,609
Tax reform		11,728	0
Management succession and executive retirement expense		12,639	0
Other		22,840	15,085
Other losses		61,311	$ 26,694
Period for refund of taxes collected at the higher rate	5 years
Abandonment loss		$ 5,876

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Management Succession and Executive Retirement Expense

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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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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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