|**Earnings per share (Tables)**                                                                                       | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|**Earnings Per Share [Abstract]**                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Schedule of Earnings Per Share Reconciliation [Table Text Block]                                                      | The following table presents our weighted average basic and diluted shares outstanding for the periods presented:Year Ended December 31,202120202019(in thousands)Weighted average common shares outstanding - basic98,54698,25164,032Dilutive effect of:RSUs and PSUs1,596——Other equity-based awards12——Weighted average common shares and equivalents outstanding - diluted100,15498,25164,032                                                                                          
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                      | Year Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                      | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                                                      | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Weighted average common shares outstanding - basic                                                                    | 98,546                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Dilutive effect of:                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|RSUs and PSUs                                                                                                         | 1,596                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Other equity-based awards                                                                                             | 12                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Weighted average common shares and equivalents outstanding - diluted                                                  | 100,154                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]                | The following table presents the weighted average common share equivalents excluded from the calculation of diluted earnings per share due to their anti-dilutive effect for the periods presented:Year Ended December 31,202120202019(in thousands)Weighted average common share equivalents excluded from diluted earnings per share due to their anti-dilutive effect:RSUs and PSUs281,707989Other equity-based awards116229302Total anti-dilutive common share equivalents1441,9361,291
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                      | Year Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                      | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                                                      | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Weighted average common share equivalents excluded from diluted earnings per share due to their anti-dilutive effect: |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|RSUs and PSUs                                                                                                         | 28                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Other equity-based awards                                                                                             | 116                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Total anti-dilutive common share equivalents                                                                          | 144                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

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