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Restructuring (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2021
USD ($)
employee
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses     $ 0 $ 0
2019 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses     $ 1,900 4,400
Restructuring and related cost, severance costs, number of employees | employee     35  
Caisson TMVR Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses     $ 300 $ 3,500
Restructuring and related cost, severance costs, number of employees | employee     50  
2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses $ 5,300 $ 9,700    
Restructuring and related cost, severance costs, number of employees | employee 54 27