Could it also be that it's being spent on advertising the hospital on television, in newspapers and on radio?
I remember a time when hospitals didn't advertise as there was no need to do so. It seems to me I'm always seeing commercials for hospitals now as well as the constant drug pushing (prescription drugs).
Advertising in the long run, usually is productive in paying for itself and generating new income. Hospital advertising has been going on for years, so I assume it's working.
That leaves me asking about the negative impact of illegal aliens on the financial well being of a Houston hospital. Houston may be the illegal alien capital of Texas.