Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 33,605,000		$ 53,506,000		$ 112,588,000		$ 187,836,000
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments	(260,000)		230,000		(346,000)		192,000
Unrecognized gain (loss) on cash flow hedges	473,000		414,000		1,416,000		1,138,000
Unrecognized gain (loss) on foreign currency translation	25,693,000		2,514,000		(18,164,000)		166,000
Total other comprehensive income (loss)	25,906,000		3,158,000		(17,094,000)		1,496,000
Total comprehensive income (loss)	59,511,000		56,664,000		95,494,000		189,332,000
Total comprehensive income (loss) attributable to noncontrolling interests	(3,881,000)	[1]	(365,000)	[1]	(9,109,000)	[1]	(2,241,000)	[1]
Total comprehensive income (loss) attributable to controlling interests	$ 63,392,000		$ 57,029,000		$ 104,603,000		$ 191,573,000

[1] (1) Includes amounts attributable to redeemable noncontrolling interests.