Financing Receivables - Concentrations by Counterparty (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) customer	Dec. 31, 2020 USD ($) customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	$ 71,952	$ 41,752
Advances receivable, number of counterparties not individually disclosed | customer	160	131
Customer Concentration Risk | Financing Receivable | Other Contractors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average balance	$ 100	$ 100
Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	67,077	35,401
Advances | Contractor 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	20,894	6,425
Advances | Contractor 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	12,470	295
Advances | Contractor 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	9,496	10,429
Advances | Contractor 4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	2,610	437
Advances | Contractor 5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	2,571	36
Advances | Contractor 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	2,093	1,812
Advances | Contractor 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	1,745	141
Advances | Contractor 8
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	855	712
Advances | Contractor 9
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	633	0
Advances | Contractor 10
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	570	0
Advances | Other Contractors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding	$ 13,140	$ 15,114
Advances | Customer Concentration Risk | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	100.00%	100.00%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	31.10%	18.10%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	18.60%	0.80%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	14.20%	29.50%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 4
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	3.90%	1.20%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 5
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	3.80%	0.10%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	3.10%	5.10%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	2.60%	0.40%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 8
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	1.30%	2.00%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 9
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	0.90%	0.00%
Advances | Customer Concentration Risk | Financing Receivable | Contractor 10
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	0.80%	0.00%
Advances | Customer Concentration Risk | Financing Receivable | Other Contractors
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of total	19.70%	42.80%
Advances | Customer Concentration Risk | Financing Receivable | Largest Other Contractors - A
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding		$ 2,600
Advances | Customer Concentration Risk | Financing Receivable | Largest Other Contractors - B
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding		600
Advances | Customer Concentration Risk | Financing Receivable | Largest Other Contractors - C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding		600
Advances | Customer Concentration Risk | Financing Receivable | Largest Other Contractors - D
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding		500
Advances | Customer Concentration Risk | Financing Receivable | Largest Other Contractors - E
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts outstanding		$ 500