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Debt - Summary of debt (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial liabilities [line items]    
Total debt $ 501,132,000 $ 479,732,000
Less: Current portion 66,667,000 66,667,000
Long-term portion 434,465,000 413,065,000
Senior Secured Notes due 2024    
Disclosure of financial liabilities [line items]    
Total debt 226,647,000 287,568,000
Term loan    
Disclosure of financial liabilities [line items]    
Total debt 131,842,000 197,761,000
Revolving credit facility    
Disclosure of financial liabilities [line items]    
Total debt 150,000,000 0
Long-term portion 150,000,000  
Redemption option derivative asset    
Disclosure of financial liabilities [line items]    
Total debt (7,357,000) (5,597,000)
Unamortized discount and transaction costs    
Disclosure of financial liabilities [line items]    
Total debt 8,680,000 13,806,000
Unamortized transaction costs    
Disclosure of financial liabilities [line items]    
Total debt $ 1,491,000 $ 2,239,000