CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Class A ordinary shares/ Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]	Total
Balance at Dec. 31, 2009	$ 14,237	$ 1,078,337	$ 2,169,526	$ (1,409)	$ (150,321)	$ 3,110,370
Balance (in shares) at Dec. 31, 2009	113,833
Shares issued to acquire SKDP (in shares)	11,725
Shares issued to acquire SKDP	1,466	336,441	0	0	0	337,907
Shares issued under share-based compensation plans	91	4,343	0	(100)	0	4,334
Shares issued under share-based compensation plans (in shares)	736
Share-based compensation	0	14,466	0	0	0	14,466
Excess tax benefit from share-based compensation plans	0	412	0	0	0	412
Retirement benefit adjustments, net of taxes	0	0	0	0	4,826	4,826
Net income	0	0	279,995	0	0	279,995
Balance at Dec. 31, 2010	15,794	1,433,999	2,449,521	(1,509)	(145,495)	3,752,310
Balance (in shares) at Dec. 31, 2010	126,294
Shares issued under share-based compensation plans	153	14,907	0	(2,362)	0	12,698
Shares issued under share-based compensation plans (in shares)	1,206
Shares reacquired	0	0	0	(125,013)	0	(125,013)
Shares reacquired (in shares)	(3,919)
Share-based compensation	0	24,199	0	0	0	24,199
Excess tax benefit from share-based compensation plans	0	5,128	0	0	0	5,128
Retirement benefit adjustments, net of taxes	0	0	0	0	(80,176)	(80,176)
Net income	0	0	736,841	0	0	736,841
Balance at Dec. 31, 2011	15,947	1,478,233	3,186,362	(128,884)	(225,671)	4,325,987
Balance (in shares) at Dec. 31, 2011	123,581
Shares issued under share-based compensation plans	65	(21,212)	0	17,511	0	(3,636)
Shares issued under share-based compensation plans (in shares)	578
Share-based compensation	0	23,018	0	0	0	23,018
Excess tax benefit from share-based compensation plans	0	1,164	0	0	0	1,164
Retirement benefit adjustments, net of taxes	0	0	0	0	4,589	4,589
Cancelation of treasury shares	(419)	(109,068)	0	109,487	0	0
Other	0	0	0	0	0	0
Other (in shares)	52
Net income	0	0	180,602	0	0	180,602
Balance at Dec. 31, 2012	$ 15,593	$ 1,372,135	$ 3,366,964	$ (1,886)	$ (221,082)	$ 4,531,724
Balance (in shares) at Dec. 31, 2012	124,211