Michael A. Marks
Executive Vice President and Chief Financial Officer at HCA Healthcare
Thank you, Sam, and good morning, everyone. The second quarter showed continued solid performance with strong demand, improved margins and a balanced allocation of capital. Sam reviewed our top line results, so I will cover operating costs in the quarter.
Operating costs were well-managed, resulting in a margin improvement of 100 basis points to prior year and sequentially to the first quarter. Labor costs as a percent of revenue improved 200 basis points from the prior year, and we continued to see good results in contract labor, which declined 25.7% from the prior year and represented 4.8% of total labor costs.
Supply costs as a percent of revenues improved 50 basis points from the prior year. On other operating costs as a percent of revenue, they did grow compared to the prior year, but it remained relatively consistent for the past four quarters. We were encouraged that year-over-year same-facility professional fee cost growth moderated to approximately 13% in the second quarter, which compares favorably to the 20% increase we experienced in the first quarter.
Adjusted EBITDA was $3.55 billion in the quarter, which represents a 16% increase over the prior year and included a modest benefit from Medicaid supplemental payments. As a management team, we are very pleased with the operational performance of the Company.
Now moving to capital allocation. We continued to deploy a balanced strategy of allocating capital for long-term value creation. Cash flow from operations was just under $2 billion in the quarter, which is a decline of $500 million to prior year, driven by increase in tax payments and timing of Medicaid supplemental program accruals and cash receipts.
Capital expenditures totaled $1.28 billion and we repurchased $1.37 billion of our outstanding shares during the quarter. We also paid about $170 million in dividends. Our debt to adjusted EBITDA leverage remains near the low-end of our stated guidance range, and we believe we are well-positioned from a balance sheet perspective.
Finally, in our release this morning, we are updating estimated guidance for 2024: for revenues, our new guidance range is $69.75 billion to $71.75 billion; net income attributable to HCA Healthcare $5.675 billion to $5.975 billion; adjusted EBITDA $13.75 billion to $14.25 billion; and diluted earnings per share $21.60 to $22.80 per share.
Based on the strength of our year-to-date results and our revised outlook, we estimate that share repurchases will be around $6 billion in 2024, subject to market conditions.
With that, I'll turn the call over to you, Frank, for questions and answers.