Catholic Health Initiatives' continuing financial struggles were made evident Tuesday when S&P Global Ratings warned that it may downgrade the Arapahoe County-based health system's credit ratings. The ratings agency already downgraded CHI's long-term and underlying ratings in April from "A" to "A-minus" because persistent operating losses and a drop in unrestricted cash had created a negative outlook for the company. In a report issued Tuesday, S&P said it now is placing that A-minus...