Revenue Concentration	12 Months Ended
Revenue Concentration	Dec. 31, 2014
Revenue Concentration [Abstract]
Revenue Concentration	(16)Revenue Concentration Revenue from the Company’s ten largest lessees represented 55.4%, 56.6% and 54.0% of total revenue for the years ended December 31, 2014, 2013 and 2012, respectively. Revenue from the Company’s single largest lessee accounted for 11.4%, or $25.9 million, 11.2 %, or $23.8 million, and 11.7%, or $20.3 million, of total revenue for the years ended December 31, 2014, 2013 and 2012, respectively. The largest lessees of the Company’s owned fleet are often among the largest lessees of its managed fleet. The largest lessees of our managed fleet are responsible for a significant portion of the billings that generate our management fee revenue.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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