Variable Interest Entities Sabine Biofuels production facility (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Variable Interest Entity [Line Items]
Percentage Of Interest Owned In Development Stage Biodiesel Production Facility	50.00%
Carrying Value of Interest Owned In Development Stage Biodiesel Production Facility	$ 10.3
Advances made to Development Stage Biodiesel Production Facility	$ 15.2