Quarterly Results of Operations (Schedule of Quarterly Financial Information) (Parenthetical) (Details) - $ / shares		3 Months Ended
	Dec. 30, 2018	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Special dividend declared per share	$ 4.75	$ 5.35	[1]	$ 0.54	[1]	$ 0.54	[1]	$ 0.54	[1]	$ 0.54	$ 0.50	$ 0.50	$ 0.50

[1] As a result of the sale of Chaucer, (see Note 2 – “Discontinued Operations”), on December 30, 2018 the Board of Directors declared a special dividend of $4.75 per share (see Note 12 – “Earnings Per Share and Shareholders’ Equity Transactions”).