Long-term incentive compensation (Details) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 204,649
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years)	1 year 4 months 24 days
Restricted stock units and Performance stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	714,000
Aggregate grant-date fair value	$ 78,287
Weighted-average expected life (in years)	3 years 6 months
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate grant-date fair value	$ 4,250
Weighted-average expected life (in years)	4 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures \| shares	132,000

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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