Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 65,200,000	$ 71,799,000
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments	549,000	172,000
Unrecognized gain (loss) on cash flow hedges	440,000	471,000
Unrecognized gain (loss) on foreign currency translation	(9,889,000)	(22,706,000)
Total other comprehensive income (loss)	(8,900,000)	(22,063,000)
Total comprehensive income (loss)	56,300,000	49,736,000
Total comprehensive income (loss) attributable to noncontrolling interests	(9,187,000)	139,000
Total comprehensive income (loss) attributable to controlling interests	$ 65,487,000	$ 49,875,000