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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Number of Weighted Average Shares The number of weighted average shares used in the calculation of basic earnings per share and diluted earnings per share was as follows for the years ended December 31:
202120202019
(In thousands)
Weighted average shares:
Basic shares230,955 229,435 227,759 
Equity-based compensation plans1,858 1,715 1,636 
Diluted shares232,813 231,150 229,395