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Employee benefit plans Performance Stock Units activity (Details) - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding (shares) 1,177 1,319 1,319
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 6.23   $ 4.48
Granted (shares) 573    
Weighted average price of shares granted (usd per share) $ 7.93    
Vested (shares) (427)    
Weighted average price of shares vested (usd per share) $ 4.59    
Forfeited (shares) (288)    
Weighted average price of shares forfeited (usd per share) $ 4.05    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding (shares) 11,087 10,639 10,639
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 6.01   $ 5.04
Granted (shares) 3,457    
Weighted average price of shares granted (usd per share) $ 8.22    
Vested (shares) (2,520)    
Weighted average price of shares vested (usd per share) $ 4.98    
Forfeited (shares) (489)    
Weighted average price of shares forfeited (usd per share) $ 5.80