Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of equity attributable to non-controlling interests
Noncontrolling interests, beginning of period	$ 1,488,000	$ 52,900,000
Net income (loss) attributable to noncontrolling interests, net of tax	(295,000)	14,435,000
Currency translation adjustment	100,000	2,800,000
Distributions to noncontrolling interests	1,300,000
Noncontrolling interests, end of period	$ 2,647,000	$ 70,100,000