Unaudited Condensed Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common shares	Treasury shares	Accumulated Other Comprehensive Loss	Retained earnings
Balance, at beginning of period at Dec. 31, 2013	$ 3,519,826	$ 418,988	$ (79,992)		$ 3,180,830
Net income	359,750				359,750
Dividends	(60,017)				(60,017)
Stock compensation	18,568		17,235		1,333
Share repurchases	(164,528)		(164,528)
Shares cancelled	0	(10,998)	92,652		(81,654)
Balance, at end of period at Sep. 30, 2014	3,673,599	407,990	(134,633)		3,400,242
Balance, at beginning of period at Dec. 31, 2014	3,778,291	408,020	(143,075)		3,513,346
Net income	82,184				82,184
Dividends	(68,751)				(68,751)
Stock compensation	13,247		18,363		(5,116)
Share repurchases	(245,301)		(245,301)
Shares cancelled	0	(21,318)	213,732		(192,414)
Foreign currency translation adjustment	(4,265)			$ (4,265)
Balance, at end of period at Sep. 30, 2015	$ 3,555,405	$ 386,702	$ (156,281)	$ (4,265)	$ 3,329,249