Concentrations	12 Months Ended
Dec. 31, 2013
Risks and Uncertainties [Abstract]
Concentrations	Concentration of Revenues We derived revenue from a wide range of industries and companies. We generated approximately 22% of our total revenues from customers in the petroleum industry, 19% from the chemical industry, 18% from the transportation industry, 11% from the steel industry, and 10% from the food/agriculture industries. Our foreign identifiable revenues were primarily derived in Germany, Canada, Poland, Mexico, and Austria. Concentration of Credit Risk We did not have revenue concentrations from any particular customer for the years ended December 31, 2013, 2012, and 2011. Under our lease agreements with customers, we typically retain legal ownership of the assets unless such assets have been financed by sale-leasebacks. We perform a credit evaluation prior to approval of a lease contract. Subsequently, we monitor the creditworthiness of the customer and the value of the collateral on an ongoing basis. We maintain an allowance for losses to provide for credit losses inherent in our reservable assets portfolio. Concentration of Labor Force As of December 31, 2013, collective bargaining agreements covered 35% of our employees. Collective bargaining agreements that have expired or will expire within the next year covered 2% of our employees. The hourly employees at our US service centers belong to the United Steelworkers. Employees at three of our Canadian service centers belong to Unifor, the union formerly known as the Communication, Energy and Paperworkers Union of Canada. The shipboard personnel at ASC belong to the American Maritime Officers and the Seafarers International Union.

Concentrations

12 Months Ended

Dec. 31, 2013

Concentration of Revenues

We derived revenue from a wide range of industries and companies. We generated approximately 22% of our total revenues from customers in the petroleum industry, 19% from the chemical industry, 18% from the transportation industry, 11% from the steel industry, and 10% from the food/agriculture industries. Our foreign identifiable revenues were primarily derived in Germany, Canada, Poland, Mexico, and Austria.

Concentration of Credit Risk

We did not have revenue concentrations from any particular customer for the years ended December 31, 2013, 2012, and 2011. Under our lease agreements with customers, we typically retain legal ownership of the assets unless such assets have been financed by sale-leasebacks. We perform a credit evaluation prior to approval of a lease contract. Subsequently, we monitor the creditworthiness of the customer and the value of the collateral on an ongoing basis. We maintain an allowance for losses to provide for credit losses inherent in our reservable assets portfolio.

Concentration of Labor Force

As of December 31, 2013, collective bargaining agreements covered 35% of our employees. Collective bargaining agreements that have expired or will expire within the next year covered 2% of our employees. The hourly employees at our US service centers belong to the United Steelworkers. Employees at three of our Canadian service centers belong to Unifor, the union formerly known as the Communication, Energy and Paperworkers Union of Canada. The shipboard personnel at ASC belong to the American Maritime Officers and the Seafarers International Union.