Consolidated Statements Of Shareholders' Equity (USD $) In Thousands		Total	Share Capital [Member]	Additional Paid-In Capital [Member]	Treasury Shares	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Balance, at beginning of period at Dec. 31, 2010		$ 3,075,820	$ 600,055	$ 170,239	$ (112,811)	$ 57,135	$ 2,361,202
Net income		274,548					274,548
Dividends — par value reduction		(42,902)	(42,902)
Other comprehensive loss		(42,651)				(42,651)
Stock compensation	[1]	24,527		(38,394)	62,921
Share repurchases		(86,700)			(86,700)
Repurchase of founder warrants		(53,620)		(53,620)
Balance, at end of period at Dec. 31, 2011		3,149,022	557,153	78,225	(136,590)	14,484	2,635,750
Net income		493,007					493,007
Dividends — par value reduction		(53,523)	(53,523)
Other comprehensive loss		(14,484)				(14,484)
Stock compensation	[1]	16,255		(27,099)	43,354
Share repurchases		(263,942)			(263,942)
Shares cancelled			(48,650)	(51,126)	243,360		(143,584)
Balance, at end of period at Dec. 31, 2012		3,326,335	454,980	0	(113,818)	0	2,985,173
Net income		417,880					417,880
Dividends — par value reduction		(12,982)	(12,982)
Dividends		(50,791)					(50,791)
Other comprehensive loss		0
Stock compensation	[1]	14,070		0	31,946		(17,876)
Share repurchases		(174,686)			(174,686)
Shares cancelled		0	(23,010)		176,566		(153,556)
Balance, at end of period at Dec. 31, 2013		$ 3,519,826	$ 418,988	$ 0	$ (79,992)	$ 0	$ 3,180,830

[1] Includes stock compensation expense for the period and shares issued out of treasury for awards exercised or vested. See note 2(o) to the notes to the consolidated financial statements.