Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 71,799	$ 57,458
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments	172	8
Unrecognized gain (loss) on cash flow hedges	471	278
Reclassification adjustment realized in net income	0	0
Unrecognized actuarial gain/(loss)	0	0
Unrecognized gain (loss) on foreign currency translation	(22,706)	0
Total other comprehensive income (loss)	(22,063)	286
Total comprehensive income	49,736	57,744
Total comprehensive income attributable to noncontrolling interests	139	(1,056)
Total comprehensive income attributable to controlling interests	$ 49,875	$ 56,688