Our primary objectives are to profitably grow our business and increase long-term distributable cash flow per share by pursuing the following strategies:
Expand our asset base. We have increased, and intend to further increase, the size of our asset base through timely and selective acquisitions of additional assets that we believe will be accretive to long-term distributable cash flow per share. We will seek to expand our asset base through placing newbuilding orders, acquiring new and modern second-hand vessels and entering into medium or long-term charter arrangements. From time to time we may also acquire vessels with no or limited initial charter coverage. We believe that by entering into newbuilding contracts or acquiring modern second-hand vessels or rigs we can provide for long-term growth of our assets and continue to decrease the average age of our fleet.
Diversify our asset base. Since January 1 2005 we have diversified our asset base from two asset types, crude oil tankers and OBO carriers, to eight asset types including container vessels, car carriers, drybulk carriers, chemical tankers, jack-up drilling rigs, ultra-deepwater drilling units and offshore supply vessels. We believe that there are several attractive markets that could provide us the opportunity to continue to diversify our asset base. These markets include vessels and assets that are of long-term strategic importance to certain operators in the shipping industry. We believe that the expertise and relationships of our management and our relationship and affiliation with Mr. John Fredriksen could provide us with incremental opportunities to expand our asset base.
Expand and diversify our customer relationships. Since January 1 2005 we have increased our customer base from one to 15 customers. Of these 15 customers, Frontline, Deep Sea Supply and Seadrill are directly or indirectly controlled by trusts established by Mr. John Fredriksen for the benefit of his immediate family. We intend to continue to expand our relationships with our existing customers and also to add new customers, as companies servicing the international shipping and offshore oil exploration markets continue to expand their use of chartered-in assets to add capacity.
Pursue medium to long-term fixed-rate charters. We intend to continue to pursue medium to long-term fixed rate charters, which provide us with stable future cash flows. Our customers typically employ long-term charters for strategic expansion as most of their assets are typically of strategic importance to certain operating pools, established trade routes or dedicated oil-field installations. We believe that we will be well positioned to participate in their growth. In addition, we will also seek to enter into charter agreements that are shorter and provide for profit sharing, so that we can generate incremental revenue and share in the upside during strong markets.