Property, Plant and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense on property, plant and equipment	$ 27.9	$ 19.3	$ 27.4
Depreciation expense on railcar assets leased to others	$ 11.1	$ 11.9	$ 15.9