CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Class A ordinary shares/ Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]
Balance at Dec. 31, 2013	$ 4,893,761	$ 15,597	$ 1,407,031	$ 3,619,540	$ (5,962)	$ (142,445)
Balance (in shares) at Dec. 31, 2013		124,237
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	904	$ 7	2,236		(1,339)
Net shares issued (acquired) under share-based compensation plans (in shares)		258
Share-based compensation	13,746		13,746
Excess tax benefit (deficit) from share-based compensation plans	(563)		(563)
Retirement benefit adjustments, net of taxes	4,828					4,828
Dividends	(12,556)			(12,556)
Other	(287)					(287)
Net income	92,439			92,439
Balance at Jun. 30, 2014	4,992,272	$ 15,604	1,422,450	3,699,423	(7,301)	(137,904)
Balance (in shares) at Jun. 30, 2014		124,495
Balance at Dec. 31, 2014	4,691,399	$ 15,604	1,436,910	3,466,993	(7,990)	(220,118)
Balance (in shares) at Dec. 31, 2014		124,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(3,166)	$ 139	397		(3,702)
Net shares issued (acquired) under share-based compensation plans (in shares)		222
Share-based compensation	12,227		12,227
Excess tax benefit (deficit) from share-based compensation plans	(2,322)		(2,322)
Retirement benefit adjustments, net of taxes	6,799					6,799
Dividends	(25,220)			(25,220)
Net income	208,404			208,404
Balance at Jun. 30, 2015	$ 4,888,121	$ 15,743	$ 1,447,212	$ 3,650,177	$ (11,692)	$ (213,319)
Balance (in shares) at Jun. 30, 2015		124,786