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Restricted cash (Tables)
6 Months Ended
Jun. 30, 2022
Restricted Cash [Abstract]  
Restricted Cash
As of June 30, 2022 and December 31, 2021, restricted cash consisted of the following:
June 30, 2022December 31, 2021
Cash held by lessor VIEs$48,666 $35,651 
Collateral for letters of credit and performance bonds27,639 27,614 
Collateral for interest rate swaps2,500 12,500 
Other restricted cash757 756 
  Total restricted cash$79,562 $76,521 
Current restricted cash$71,602 $68,561 
Non-current restricted cash7,960 7,960