Shareholders' Equity (Dividends Declared and Paid) (Details) - USD ($)																													12 Months Ended
	Dec. 24, 2020	Sep. 25, 2020	Jun. 26, 2020	Mar. 20, 2020	Dec. 27, 2019	Nov. 27, 2019	Sep. 20, 2019	Aug. 20, 2019	Jun. 28, 2019	May 28, 2019	Mar. 22, 2019	Feb. 20, 2019	Dec. 28, 2018	Oct. 12, 2018	Sep. 21, 2018	Jul. 31, 2018	Jun. 29, 2018	Apr. 24, 2018	Mar. 23, 2018	Feb. 01, 2018	Dec. 15, 2017	Oct. 19, 2017	Sep. 22, 2017	Jul. 25, 2017	Jun. 30, 2017	Apr. 25, 2017	Mar. 24, 2017	Feb. 01, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends [Abstract]
Common stock, cash dividends declared (in dollars per share)						$ 0.60		$ 0.60				$ 0.70		$ 0.70		$ 0.68		$ 0.68		$ 0.68		$ 0.68		$ 0.63		$ 0.63		$ 0.63
Common stock, cash dividends paid (in dollars per share)	$ 0.60	$ 0.60	$ 0.60	$ 0.70	$ 0.70		$ 0.68		$ 0.68	$ 0.60	$ 0.68		$ 0.68		$ 0.63		$ 0.63		$ 0.63										$ 2.50	$ 2.74	$ 2.57
Dividend Amount (1)					$ 137,943,000		$ 130,697,000		$ 129,071,000		$ 150,574,000		$ 150,285,000		$ 145,984,000		$ 145,978,000		$ 145,954,000		$ 145,627,000		$ 134,844,000		$ 134,631,000		$ 134,490,000
Dividends, Common Stock, Cash	$ 27,600,000	$ 26,200,000	$ 25,800,000
Dividends, Common Stock, Stock	$ 110,300,000	$ 104,500,000	$ 103,200,000
Common Stock Dividends, Shares	2,543,675	2,767,704	2,697,946
Share Price	$ 43.3758	$ 37.7635	$ 38.2643