Stockholder's Equity (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Summary of comprehensive income/(loss)
Unrecognized gain (loss) on cash flow hedges	$ 471		$ 278
Unrecognized gains (losses) on equity investments	172		8
Unrecognized gain (loss) on foreign currency translation	(22,706)		0
Total other comprehensive income (loss)	(22,063)		286
Comprehensive income (loss) attributable to controlling interests	49,875		56,688
Less: Net income (loss) attributable to noncontrolling interests	139	[1]	(1,056)	[1]
Total comprehensive income (loss)	$ 49,736		$ 57,744

[1] Includes amounts attributable to redeemable noncontrolling interests.