XML 55 R41.htm IDEA: XBRL DOCUMENT v3.21.2
- Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]        
Cash and cash equivalents $ 100,238 $ 20,168    
Restricted cash included in other long-term assets 20,293 20,817    
Total cash, cash equivalents and restricted cash $ 120,531 $ 40,985 $ 46,812 $ 32,891