One classical method is to use a comparator whose output is in the logic family voltage range you want and set the input compare voltage to half way between the HIGH and LOW voltage levels of the logic family you are wanting to convert.
The comparator for such high speed case may consists of a differential transistor pair followed by a level shifting transistor. This is a cheap solution too.
I think that an application note written by ON Semiconductor might be helpful here. It is AN1568/D "Interfacing between LVDS and ECL". The web page is onsemi.com