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Debt - Additional Information (Details)
$ in Thousands
6 Months Ended
Apr. 23, 2020
USD ($)
Apr. 23, 2020
CAD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Debt Instrument [Line Items]            
Proceeds from issuance of debt     $ 221,130 $ 900,767    
Interest expense on debt     $ 35,000 $ 27,000    
PEI Finance Term Loan October 2018 | Term loan            
Debt Instrument [Line Items]            
Original loan amount         $ 1,500,000 $ 2,000
Interest rate         4.00% 4.00%
Proceeds from issuance of debt $ 221,000 $ 300