Other Non-Current Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Land lease and purchase options	$ 6,040	$ 5,831
Permitting costs	13,345	13,092
Right of use asset — operating leases	11,469	11,884
Other	1,952	2,090
Total other non-current assets	$ 32,806	$ 32,897
Land lease and purchase option agreements, maximum terms (in years)	50 years