Business Combinations - IncoPat Narrative (Details) - USD ($)		3 Months Ended	9 Months Ended
	Oct. 26, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Total purchase price, net of cash acquired			$ 14,314,000	$ 885,323,000
Restricted cash		$ 1,854,257,000	1,854,257,000	$ 567,000	$ 11,278,000	$ 9,000
IncoPat
Business Acquisition [Line Items]
Percentage of ownership	100.00%
Total purchase price, net of cash acquired	$ 52,133,000
Restricted cash	6,313,000
Goodwill deductible amount	$ 0
Revenues, net		2,470,000	6,801,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 126,000	(853,000)
Goodwill purchase accounting adjustments			$ (136,000)