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Stockholders' equity - ASR - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Sep. 09, 2021
May 03, 2021
May 27, 2020
Jan. 30, 2020
Feb. 28, 2022
Sep. 30, 2021
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stockholders Equity Note                      
Accelerated share repurchases price paid per share                     $ 53.58
Accelerated share repurchases settlement receipt             $ 250,000   $ 350,000 $ 500,000 $ 250,000
Common stock purchases                 355,650 504,172 256,012
Initial shares received as part of an accelerated share repurchase program               3,500,000      
Common Shares Repurchased Accelerated Share Repurchase Agreements             1,165,607        
Treasury stock                      
Stockholders Equity Note                      
Common stock purchases                 347,093 580,507 271,752
Capital surplus                      
Stockholders Equity Note                      
Common stock purchases                 $ 8,557 $ (76,335) (15,740)
Accelerate share repurchase                      
Stockholders Equity Note                      
Stock Repurchased During Period Shares 4,614,796                    
Stock repurchase program authorized amount   $ 350,000   $ 500,000              
Accelerated share repurchases price paid per share $ 75.8430         $ 75.84          
Accelerated share repurchases settlement receipt           $ 350,000          
Initial shares received as part of an accelerated share repurchase program   3,785,831   7,055,919              
Common Shares Repurchased Accelerated Share Repurchase Agreements 828,965                    
Accelerate share repurchase | Treasury stock                      
Stockholders Equity Note                      
Common stock purchases $ 61,000                   266,000
Reduction in capital surplus   $ 280,000   $ 400,000              
Accelerate share repurchase | Capital surplus                      
Stockholders Equity Note                      
Common stock purchases                     $ 16,000
Reduction in capital surplus   $ (70,000)   $ (100,000)              
Accelerate share repurchase | Subsequent event                      
Stockholders Equity Note                      
Stock repurchase program authorized amount         $ 400,000            
Accelerate share repurchase | Subsequent event | Treasury stock                      
Stockholders Equity Note                      
shareholders equity increase decrease recognized during the period         (320,000)            
Accelerate share repurchase | Subsequent event | Capital surplus                      
Stockholders Equity Note                      
shareholders equity increase decrease recognized during the period         $ (80,000)            
Accelerate share repurchase | COVID 19                      
Stockholders Equity Note                      
Stock Repurchased During Period Shares     11,819,135                
Accelerated share repurchases price paid per share     $ 42.3043                
Common Shares Repurchased Accelerated Share Repurchase Agreements     4,763,216