Nationstar Mortgage Holdings posted strong profits for the second quarter of 2012 due to the company’s expanding servicing portfolio and refinances of loans in the portfolio. The nonbank had $36.3 million in net income for the quarter even after taking a $20.9 million decrease in the fair value of its mortgage servicing rights. “The primary driver of profitability continues to be servicing performance,” said Jay Bray, CEO of Nationstar, during a call with investors last week to announce the company’s earnings ...