v3.20.1

- Additional Information (Details)			3 Months Ended
	Apr. 23, 2020 USD ($)	May 22, 2019 USD ($)	Mar. 31, 2020 USD ($) agreement	Mar. 31, 2019 USD ($)	Feb. 25, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term debt, current maturities			$ 300,000			$ 600,000
Debt issuance costs, net			9,284,000			7,238,000
Debt instrument, minimum unrestricted cash			25,000,000.0
Interest expense			$ 5,493,000	$ 55,000
Number of contracts (in contracts) | agreement			2
Deferred government grant obligations			$ 3,500,000			3,500,000
Prince George's County, Maryland
Debt Instrument [Line Items]
Interest rate			3.00%
Deferred Government Grant Obligations
Debt Instrument [Line Items]
Interest payable			$ 300,000			$ 300,000
Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Term loan		$ 250,000,000
Debt issuance costs, net					$ 2,500,000
Interest rate during period			8.90%
Interest expense			$ 5,400,000
Interest payable			$ 100,000
Base Rate | Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Variable rate, applicable margin		5.75%
Base Rate | Credit Agreement | Letter of Credit | Minimum
Debt Instrument [Line Items]
Variable rate, applicable margin		2.00%
LIBOR | Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Variable rate, applicable margin		6.75%
LIBOR | Credit Agreement | Letter of Credit | Minimum
Debt Instrument [Line Items]
Variable rate, applicable margin		1.00%
Prior To First Anniversary of First Amendment Effective Date | Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Debt instrument, prepayment premium		2.00%
Debt instrument, prepayment penalty		1.00%
On Or After First Anniversary of First Amendment Effective Date | Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Debt instrument, prepayment premium		1.00%
Subsequent Event | Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Repayments of Debt	$ 250,000,000

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