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Financial Instruments - Derivatives Not Designated as Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jul. 17, 2019
Level 2
Derivative [Line Items]
Derivative and warrant liabilities	$ 4,900		$ 4,900		$ 7,000
Interest Rate Collar
Derivative [Line Items]
Derivative instruments not designated as hedges, gain (loss)	$ (400)	$ 800	$ (2,160)	$ 6,800
Interest Rate Collar \| Not Designated as Hedging Instrument
Derivative [Line Items]
Interest rate collar amount						$ 170,000