Other income and operating expenses - Balance Sheet Impact of PPP Activities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Restricted cash	$ 51,569	$ 47,697	$ 51,728
Paycheck Protection Program loans	870,352	74,931
PPP fee receivable	407	18
Accrued interest	21,873	12,656
Total Assets	9,534,031	5,372,095
Liabilities
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	941,505	76,276
Interest payable	22,278	19,695
Deferred LSP revenue	286	10,700
Accrued PPP Related Costs	12,460	498
Repair and denial reserve	19,725	9,557
Total Liabilities	8,245,072	4,537,887
Paycheck Protection Program loans
Assets
Restricted cash		178
Prepaid expenses		77
PPP fee receivable	407	18
Accrued interest	7,025	510
Total Assets	877,784	75,714
Liabilities
Interest payable	2,358	104
Deferred LSP revenue	286	10,700
Accrued PPP Related Costs	12,460	498
Payable to third parties	2,091	2,716
Repair and denial reserve	12,844	3,305
Total Liabilities	971,544	93,599
Paycheck Protection Program Loans
Assets
Paycheck Protection Program loans	867,109
Paycheck Protection Program Loans | Paycheck Protection Program loans
Assets
Paycheck Protection Program loans	867,109
Paycheck Protection Program loans, at fair value
Assets
Paycheck Protection Program loans	3,243	74,931
Paycheck Protection Program loans, at fair value | Paycheck Protection Program loans
Assets
Paycheck Protection Program loans	$ 3,243	$ 74,931