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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle
Guaranty liabilities	$ 23,232		$ 23,232		$ 29,581		$ 15
Provision for expected credit losses	(4,700)	$ 200	(6,349)	$ 32,600	11,631
Total stockholders’ equity	1,225,221		1,225,221		655,049
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle
Guaranty liabilities						$ 17,900	17,935
Accounts Receivable
New Accounting Pronouncements or Change in Accounting Principle
Allowance for doubtful accounts	$ 15,800		$ 15,800		13,400
Accounts Receivable | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle
Increase in reserve					4,200
Loans Receivable
New Accounting Pronouncements or Change in Accounting Principle
Allowance for credit loss					$ 3,700
Loans Receivable | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle
Total stockholders’ equity							$ 3,700

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