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Other Non-Current Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Non-Current Assets Other non-current assets consist of the following (in thousands):
June 30, 2021December 31, 2020
Land lease and purchase options$6,138 $5,831 
Permitting costs13,374 13,092 
Right of use asset — operating leases11,044 11,884 
Other1,933 2,090 
Total other non-current assets$32,489 $32,897