Comprehensive Income (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassifications out of accumulated other comprehensive income (loss)
Interest expense	$ 6,955	$ 6,881
Corporate general and administrative expense	(32,602)	(37,842)
Income tax expenses	(93,077)	(63,625)
NET EARNINGS	213,256	177,175
Less: Noncontrolling interest	46,798	22,293
Net of tax and noncontrolling interest	166,458	154,882
Defined benefit pension plan | Reclassifications out of accumulated other comprehensive income (loss)
Reclassifications out of accumulated other comprehensive income (loss)
Defined benefit pension plan adjustments	(3,236)
Income tax expenses	1,214
NET EARNINGS	(2,022)
Unrealized loss on derivative contracts | Reclassifications out of accumulated other comprehensive income (loss)
Reclassifications out of accumulated other comprehensive income (loss)
Income tax expenses	40
NET EARNINGS	(67)
Less: Noncontrolling interest	1
Net of tax and noncontrolling interest	(68)
Unrealized loss on derivative contracts | Reclassifications out of accumulated other comprehensive income (loss) | Commodity swaps and foreign currency forwards
Reclassifications out of accumulated other comprehensive income (loss)
Total cost of revenue	312
Unrealized loss on derivative contracts | Reclassifications out of accumulated other comprehensive income (loss) | U.S. Treasury rate lock agreements
Reclassifications out of accumulated other comprehensive income (loss)
Interest expense	(419)
Unrealized gain on available-for- sale securities | Reclassifications out of accumulated other comprehensive income (loss)
Reclassifications out of accumulated other comprehensive income (loss)
Corporate general and administrative expense	38
Income tax expenses	(14)
NET EARNINGS	$ 24