XML 123 R76.htm IDEA: XBRL DOCUMENT v3.20.1
Asset Retirement Obligation - Asset Retirement Obligation Rollforward (Details) - Asset retirement obligation [member]
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of other provisions [Line Items]  
Balance, beginning of year $ 12,113
Changes in estimates for asset retirement obligations and additional obligations recognized 746
Obligations settled (46)
Asset retirement obligation accretion 215
Effect of movements in foreign exchange rates 584
Balance, end of year $ 13,612