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Allowance for credit losses
12 Months Ended
Dec. 31, 2020
Credit Loss [Abstract]  
Allowance for credit losses Allowance for credit losses
Movements in the allowance for credit losses during year ended December 31, 2020 were as follows:
Year Ended
December 31, 2020
Allowance for credit losses at beginning of period$— 
Cumulative effect due to adoption of new accounting standard30,264 
Current period provision for expected credit losses50,215 
Write-offs charged against the allowance(13,326)
Allowance for credit losses at end of period$67,153 
During the year ended December 31, 2020, we increased our credit provision, classified in leasing expenses, by $50.2 million primarily to reflect the increased credit risk due to the Covid-19 pandemic.