Capital Stock (Schedule of Common Stock Shares Purchased and Retired) (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capital Stock [Abstract]
Shares of common stock purchased	794,227	824,685	962,023
Shares of common stock retired	798,166	830,338	957,495