Equity (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reconciliation of equity attributable to non-controlling interests
Noncontrolling interests, beginning of period	$ 600,000	$ 2,600,000	$ 2,272,000	$ 1,500,000
Net income attributable to noncontrolling interests, net of tax	0	295,000	0	0
Currency translation adjustment	0	0	0	100,000
Deconsolidation of noncontrolling interest	0	(500,000)	(1,700,000)	(500,000)
Distributions to noncontrolling interests	0	0	0	1,300,000
Noncontrolling interests, end of period	$ 596,000	$ 2,400,000	$ 596,000	$ 2,400,000