On a same-facility basis, operating margins for our acute care hospitals decreased to 13.3% during the fourth quarter of 2011 from 14.4% during the fourth quarter of 2010. We also note that they were no EHR related revenues included in our quarterly financial statements.
Our acute care hospitals provided charity care and uninsured discounts based on charges at established rates, amounting to $248 million and $208 million during the three month periods ended December 31, 2011 and 2010.
As a percentage of acute care net revenues, bad debt, charity care expense and the uninsured discount in this year's fourth quarter were at levels higher than those experienced during the fourth quarter of 2010. However, due primarily to the increase in behavioral health revenues in the very low levels of bad debt and uninsured discounts in that business or overall percentage of bad debts, charity care and uninsured discounts were lower than those experienced during the fourth quarter of 2010.
Our cash from operating activities was approximately $156 million during the fourth quarter of 2011 as compared to $89 million in the fourth quarter of 2010. Our accounts receivable days outstanding increased to 49 days during the fourth quarter of 2011, primarily due to a slowdown in Medicaid payments from the State of Illinois.
At December 31, 2011, our ratio of debt to total capitalization was 61%. We spent $90 million on capital expenditures during the fourth quarter. Included in our capital expenditures were the construction cost related to a 97 bed replacement behavioral hospital in Kentucky, which recently opened and the ongoing construction of a new acute care hospital in Temecula, California.
We opened a total of 263 new behavioral health beds at some of our busiest facilities in 2011. And effective in the first quarter of 2012, we have completed all of the divestitures required by the FTC as part of the PSI acquisition. The proceeds from these divestitures totaled approximate $115 million consistent with our expectations.
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