decreased net debt repayments. In the six months ended June 30, 2020, we repurchased a total of $300.0 million of our common stock compared to $50.0 million in the six months ended June 30, 2019. Net debt repayments in the six months ended June 30, 2020 were $98.0 million compared to $195.0 million in the six months ended June 30, 2019.
On July 21, 2020, our Board of Directors declared the 2020 third quarter cash dividend of $0.625 per share. We have increased our quarterly dividend 27 times since our IPO in 1994, with the most recent increase of 13.6% from $0.55 per share to $0.625 per share effective in the first quarter of 2020. We have never reduced or suspended our dividend and have paid regular quarterly dividends to our stockholders for 61 consecutive years.
On October 23, 2018, our Board of Directors amended our share repurchase plan, increasing the total authorized number of shares available to be repurchased by 5.0 million and extending the duration of the plan through December 31, 2021. We did not repurchase any shares in the second quarter of 2020. In the six months ended June 30, 2020, we repurchased 3,329,824 shares of our common stock at an average cost of $90.09 per share, for a total of $300.0 million. As of June 30, 2020, we had authorization under the plan to repurchase approximately 3.1 million shares, or about 5% of our current outstanding shares. From the inception of the plan in 1994 through June 30, 2020, we have repurchased approximately 32.5 million shares at an average cost of $47.57 per share. We expect to continue to be opportunistic in our approach to repurchasing shares of our common stock.
Liquidity
Our primary sources of liquidity are funds generated from operations and our $1.5 billion revolving credit facility. Our total outstanding debt at June 30, 2020 was $1.50 billion, compared to $1.60 billion at December 31, 2019. As of June 30, 2020, we had $300.0 million of outstanding borrowings, $37.5 million of letters of credit issued and $1.16 billion available for borrowing on our revolving credit facility. As of June 30, 2020, we had $222.7 million in cash and cash equivalents and our net debt-to-total capital ratio (net debt-to-total capital is calculated as total debt, net of cash, divided by total Reliance stockholders’ equity plus total debt, net of cash) was 20.4%, down from 21.4% as of December 31, 2019. Net debt repayments on our revolving credit facility were $331.0 million during the second quarter of 2020.
On September 30, 2016, we entered into a $2.1 billion unsecured five-year credit agreement (“Credit Agreement”) comprised of a $1.5 billion unsecured revolving credit facility and a $600.0 million unsecured term loan, with an option to increase the revolving credit facility up to an additional $500.0 million at our request, subject to approval of the lenders and certain other customary conditions. We intend to use the revolving credit facility for working capital and general corporate purposes, including, but not limited to, capital expenditures, dividend payments, repayment of debt, share repurchases, internal growth initiatives and acquisitions. The $600.0 million term loan due September 30, 2021 amortizes in quarterly installments, with an annual amortization of 10% until June 2021, with the balance to be paid at maturity. All borrowings under the Credit Agreement may be prepaid without penalty.
A revolving credit facility with a credit limit of $7.7 million is in place for an operation in Asia with an outstanding balance of $4.2 million and $4.3 million as of June 30, 2020 and December 31, 2019, respectively.
Capital Resources
On November 20, 2006, we entered into an indenture (the “2006 Indenture”) for the issuance of $600.0 million of unsecured debt securities. The total debt issued was comprised of two tranches, (a) $350.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 6.20% per annum, which matured and were repaid on November 15, 2016 and (b) $250.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 6.85% per annum, maturing on November 15, 2036.
On April 12, 2013, we entered into an indenture (the “2013 Indenture” and, together with the 2006 Indenture, the “Indentures”) for the issuance of $500.0 million aggregate principal amount of senior unsecured notes at the rate of 4.50% per annum, maturing on April 15, 2023.
Under the Indentures, the notes are senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured and unsubordinated obligations. If we experience a change in control accompanied by a