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RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET
Right-of-use assets under operating leases, net consists of the following as of December 31:
(in thousands)20212020
Right-of-use assets under operating leases$19,595 $31,932 
Less: Accumulated amortization(12,001)(13,719)
Total$7,594 $18,213 
Amortization of operating leases was $7.9 million and $10.2 million for the years ended December 31, 2021 and 2020, respectively, and is included in cost of revenue for operating assets and in selling, general and administrative expenses for non-operating assets in the consolidated statements of operations and comprehensive income (loss).