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Shareholders' Equity (Shareholders' Equity Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
stock_class
vote
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Schedule of Shareholders' Equity Activity [Line Items]      
Number of classes of common stock | stock_class 3    
Preferred stock authorized (in shares) 500,000 500,000  
Preferred stock, par value (in dollars per shares) | $ / shares $ 0.01 $ 0.01  
Preferred stock issued 0 0  
Stock repurchase program, authorized amount (up to) | $     $ 100,000,000
Reclassification of foreign currency translation adjustments | $ $ 0 $ 0  
Common Class A      
Schedule of Shareholders' Equity Activity [Line Items]      
Number of votes per share | vote 1    
Number of shares repurchased 0 0  
Remaining authorized repurchase amount | $ $ 100,000,000    
Common stock, shares authorized 105,000,000 105,000,000  
Common Class B      
Schedule of Shareholders' Equity Activity [Line Items]      
Number of votes per share | vote 10    
Common stock, shares authorized 80,000,000 80,000,000.0  
Common Class C      
Schedule of Shareholders' Equity Activity [Line Items]      
Number of votes per share | vote 10    
Common stock, shares authorized 20,000,000.0 20,000,000