Impact of COVID-19 - COVID-19 Legislation (Details) - USD ($)		3 Months Ended	6 Months Ended	8 Months Ended	12 Months Ended
	Apr. 20, 2020	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 10, 2021	Dec. 24, 2020	Apr. 09, 2020
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)					$ (377,715,000)	$ (302,761,000)	$ 717,000
Accounts receivable, net				$ 42,940,000	$ 128,828,000	42,940,000
Payroll Support Program, Low-Interest Loan, CARES Act | Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Debt face amount	$ 73,300,000
Debt term	10 years
Payroll Support Program 2 And 3, Low-Interest Loan, CARES Act | Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Debt term					10 years
CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Number of warrants issued as a percent of outstanding stock					1.00%
Payroll Support Program, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Proceeds received from payroll support program						344,400,000
Shares of common stock subject to warrants issued to the united states treasury (in shares)	520,797
Strike price (in dollars per share)										$ 14.08
Adjustments to additional paid in capital, warrant issued	$ 3,900,000
Special charges (credits)						(266,800,000)
Payroll Support Program, Grant, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Amount recorded as special credits for unused PSP proceeds due to COVID-19				267,200,000
Payroll Support Program 2, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Proceeds received from payroll support program			$ 212,100,000
Shares of common stock subject to warrants issued to the united states treasury (in shares)					137,753
Strike price (in dollars per share)									$ 24.42
Adjustments to additional paid in capital, warrant issued			2,800,000
Payroll Support Program 3, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Proceeds received from payroll support program		$ 197,900,000
Shares of common stock subject to warrants issued to the united states treasury (in shares)					80,539
Strike price (in dollars per share)								$ 36.45
Adjustments to additional paid in capital, warrant issued					$ 1,500,000
Payroll Support Program 3, CARES Act | Payroll Support Program, Low-Interest Loan, CARES Act | Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Debt term		10 years
Payroll Support Program 2 And 3, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Proceeds received from payroll support program					342,700,000
Payroll Support Program 2 And 3, CARES Act | Payroll Support Program 2 And 3, Low-Interest Loan, CARES Act | Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Debt face amount					63,000,000
CARES Act Employee Retention Credit
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)			$ (37,500,000)
Accounts receivable, net					$ 40,800,000
CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Strike price (in dollars per share)					$ 14.08
Adjustments to additional paid in capital, warrant issued					$ 4,300,000
Number of warrants issued as a percent of outstanding stock					100.00%
Social security tax, employer, deferral, CARES Act				$ 23,200,000	$ 11,700,000	$ 23,200,000