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Senior Notes payable and letter of credit facilities (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities
As of December 31, 2020, the Company had entered into the following letter of credit facilities:
Letters of CreditCollateral
Committed CapacityIssuedCash and Cash Equivalents
Committed - Secured letters of credit facilities$225,000 $99,638 $102,283 
Uncommitted - Secured letters of credit facilitiesn/a203,749 203,749 
$303,387 $306,032