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New Accounting Pronouncements (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 06, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jan. 01, 2022
Dec. 31, 2021
Jan. 29, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Long-term debt   $ 982,427     $ 982,427     $ 672,407  
Paid-in capital   401,182     401,182     396,771  
Deferred income taxes   105,938     105,938     68,537  
Retained earnings   352,089     352,089     $ 496,605  
Interest expense   $ 5,928   $ 9,420 $ 10,926 $ 19,772      
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares)   0   1,362 0 1,201      
Repayments of Convertible Debt         $ 275,000 $ 0      
2.625 Percent Convertible Notes Due 2024 | Convertible Notes Payable [Member]                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Interest rate, stated percentage                 2.625%
Repayments of Convertible Debt $ 275,000                
Debt instrument, face amount   $ 70,000     $ 70,000       $ 345,000
Accounting Standards Update 2020-06                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Long-term debt             $ 22,600    
Paid-in capital             (37,900)    
Deferred income taxes             (5,500)    
Retained earnings             $ 20,800    
Interest expense     $ (2,600)            
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares)     2,500