Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Sep. 30, 2011 Railcar	Jun. 30, 2012
Contingencies (Textual) [Abstract]
Number of tank cars voluntarily recertified by Company	948
Inspection cycle for tank cars in service minimum		3 years
Inspection cycle for tank cars in service maximum		5 years
Minimum possible loss		$ 4.1
Maximum possible loss		20.6
Total Accruals		10.4
Reserve for probable and estimable liabilities with respect to the investigations, assessments and remedial responses		$ 7.6