Our primary goal is to increase shareholder value through profitable growth. Our investment strategy to achieve this goal is based on three principles—opportunistic investing, portfolio diversification and conservative financing.
We make investment decisions that are expected to drive profitable growth and create shareholder value. We attempt to position ourselves to create and take advantage of situations to meet our goals and investment criteria. We acquire and develop properties and provide mortgage and other financing to healthcare providers.
We believe in maintaining a portfolio of healthcare investments diversified by segment, geography, operator, tenant and investment product. Diversification reduces the likelihood that a single event would materially harm our business and allows us to take advantage of opportunities in different markets based on individual market dynamics. While pursuing our strategy of diversification, within the constraints of our various debt agreements, we do not limit our investments based on the percentage of our total assets that may be invested in any one property, segment, geographic location or in the number of properties which we may invest in, lease or lend to a single operator or tenant. With investments in multiple segments, we can focus on opportunities with the best risk/reward profile for our portfolio as a whole.
We believe a conservative balance sheet is important to our ability to execute our opportunistic investing approach. We strive to maintain a conservative balance sheet by actively managing our debt-to-equity levels and maintaining multiple sources of liquidity, such as our revolving line of credit, access to capital markets and secured debt lenders, relationships with current and prospective institutional joint venture partners and our ability to divest of assets. Our debt is primarily fixed rate, which reduces the impact of rising interest rates on our operations. Generally, we attempt to match the duration of our investments with fixed-rate financing.
We may structure transactions as master leases, require operator or tenant insurance and indemnifications, obtain enhancements in the form of letters of credit or security deposits and take other measures to mitigate risk. We finance our investments based on our evaluation of available sources of funding. For short-term purposes, we may utilize our revolving line of credit or arrange for other short-term borrowings from banks or other sources. We arrange for longer-term financing through offerings of securities, placement of mortgage debt and capital from other institutional lenders and equity investors.