RE:RE:RE:re crh year to datetheinvestor22 is correct that the drop in margins at GAA was due to a single payor losing market share. When they initially acquired GAA this payor made up a large chunk of the reimbursements but over the last couple years this payor has lost market share to other companies. This happens as local business and families switch their healthcare coverage to different companies. As of the end Q1 2017 this payor had lost almost all of their market share therefore going forward the downward pressure on margins at GAA will no longer occur because there isn't reliance on any one payor (according to management on the conference call.)
"And by how much are the others undercutting in price and how long will it be until CRH's insurer has to follow to stay competitive?"
This statement above doesn't really make sense because CRH gets reimbursed by a myriad of insurers. Each city and even each location has a different set of companies who reimburse them. It was just an unusual circumstance where GAA had a high margin payor initially. Margins should now be stable at GAA on a go forward basis because the higher margin declining payor is now at a size of inconsequence.