Special Credits - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]
Special credits	$ (176,938,000)	$ 0
Payroll Support Program 2, Grant
Unusual or Infrequent Item, or Both [Line Items]
Amount recorded to deferred payroll liability for unused PSP proceeds due to COVID-19	156,500,000
CARES Act Employee Retention Credit
Unusual or Infrequent Item, or Both [Line Items]
Special credits	21,300,000
COVID-19 Pandemic
Unusual or Infrequent Item, or Both [Line Items]
Severance costs and costs for voluntary separations	$ 800,000