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Common Stockholders' Equity
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Common Stockholders' Equity Common Stockholders’ Equity
The weighted average number of shares used in the computation of net income per share was as follows:
(In thousands)202120202019
Basic184,953 186,924 190,722 
Diluted186,499 188,763 193,521 

Treasury shares have been excluded from average outstanding shares from the date of acquisition. The weighted average number of basic shares outstanding includes the impact of 7,728,466 common shares held in a grantor trust. The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since shares deliverable under vested RSUs were already included in diluted shares outstanding. The difference in calculating basic and diluted net income per share is attributable entirely to the dilutive effect of stock-based compensation plans. Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units (including shares held in the grantor trust).
202120202019
Balance, beginning of year177,825,150 183,411,907182,993,640
Shares issued708,057 776,544 687,339
Shares repurchased(1,752,619)(6,363,301)(269,072)
Balance, end of year176,780,588 177,825,150183,411,907

The amount of dividends paid is dependent upon factors such as the receipt of dividends from our subsidiaries, our results of operations, cash flow, financial condition and business needs, the capital and surplus requirements of our subsidiaries, and applicable insurance regulations that limit the amount of dividends that may be paid by our regulated insurance subsidiaries.