Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of equity attributable to non-controlling interests
Noncontrolling interests, beginning of period	$ 2,272,000	$ 1,500,000
Net loss attributable to noncontrolling interests, net of tax	0	(295,000)
Currency translation adjustment	0	100,000
Deconsolidation of noncontrolling interest	(1,700,000)	0
Distributions to noncontrolling interests	0	1,300,000
Noncontrolling interests, end of period	$ 596,000	$ 2,600,000