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Fair value measurements (Other Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Jun. 29, 2018
8.75% Senior Notes due 2023      
Fair Value of Other Financial Instruments      
Debt instrument, interest rate     8.75%
Senior Notes | 8.75% Senior Notes due 2023      
Fair Value of Other Financial Instruments      
Debt instrument, interest rate 8.75%    
Significant other observable inputs (Level 2) | Senior Notes | 8.75% Senior Notes due 2023 | Carrying value      
Fair Value of Other Financial Instruments      
Debt $ 300,000 $ 300,000  
Significant other observable inputs (Level 2) | Senior Notes | 8.75% Senior Notes due 2023 | Estimated fair value      
Fair Value of Other Financial Instruments      
Debt 13,500 133,050  
Significant other observable inputs (Level 2) | Credit facility | Carrying value      
Fair Value of Other Financial Instruments      
Debt 145,000 130,000  
Significant other observable inputs (Level 2) | Credit facility | Estimated fair value      
Fair Value of Other Financial Instruments      
Debt 145,000 130,000  
Significant other observable inputs (Level 2) | Other secured debt | Carrying value      
Fair Value of Other Financial Instruments      
Debt 58 371  
Significant other observable inputs (Level 2) | Other secured debt | Estimated fair value      
Fair Value of Other Financial Instruments      
Debt $ 58 $ 371