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RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET
 12 Months Ended
Dec. 31, 2020
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)20202019
Right-of-use assets under operating leases$31,932 $39,729 
Less: Accumulated amortization(13,719)(10,655)
Total$18,213 $29,074 
Amortization of operating leases was $10.2 million and $11.8 million for the years ended December 31, 2020 and 2019, respectively (no comparative amount for the year ended December 31, 2018), 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 loss.