|**Earnings per Share of Common Stock**                             | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Earnings Per Share [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Earnings per Share of Common Stock                                 | Earnings per Share of Common StockThe numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:Three Months EndedMarch 31,20222021Denominator for basic earnings per share - weighted average shares157,018,566161,526,733Effect of dilutive stock options and share units1,299,1331,258,590Denominator for diluted earnings per share158,317,699162,785,323
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|                                                                   | Three Months EndedMarch 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                   | 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Denominator for basic earnings per share - weighted average shares | 157,018,566                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Effect of dilutive stock options and share units                   | 1,299,133                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Denominator for diluted earnings per share                         | 158,317,699                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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