Property Plant and Equipment (Details Textuals) (USD $) In Millions	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Property Plant and Equipment (Textuals) [Abstract]
Depreciation expense on property, plant and equipment	$ 9.9	$ 9.2	$ 18.7
Depreciation expense on railcar assets leased to others	$ 6.7	$ 7.4	$ 14.0

The reporting period depreciation, depletion and amortization expense on long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, and production equipment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 5

Name:	us-gaap_AccumulatedDepreciationDepletionAndAmortizationExpensePropertyPlantAndEquipmentCurrentCharge
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration