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Senior notes payable and letter of credit facilities (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of credit facilities
As of June 30, 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  $59,949  $59,949  
Uncommitted - Secured letters of credit facilitiesn/a202,279  202,279  
$262,228  $262,228