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Other net losses Other Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Acquisition and transition-related costs	$ 882	$ 3,116	$ 2,984	$ 3,142
Tax reform	0	11,728	0	11,728
Management succession and executive retirement expense	0	6,952	0	6,952
Other	931	5,144	7,213	6,008
Other losses	$ 1,813	$ 26,940	$ 10,197	$ 27,830

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- Definition

Management Succession and Executive Retirement Expense

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- Definition

Other Nonoperating Expense, Refund of Excess Taxes Collected

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of expense related to nonoperating activities, classified as other.

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