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Leased Railcars (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Railcards Available for Lease Classified as Long-Term Assets	$ 43,435	$ 54,746
Railcards Available for Lease Classified as Long-Term Assets, Cost	48,234	59,217
Railcards Available for Lease Classified as Long-Term Assets, Accumulated Depreciation	4,799	4,471
Lease Utilization Rate	100.00%	100.00%
Depreciation Expense on Leased Railcars	$ 1,267	$ 1,980	$ 1,798
Maximum [Member]
Lease Term	10 years

The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

The gross amount of lessor property subject to or available for lease as of the balance sheet date.

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.