Company Achieved Record Revenues, Profits and Diluted Earnings per Share in the Second Quarter; Heritage Aggregates Pricing Increased 4 Percent and Shipments Increased 3 Percent; Acquired Operations Contributed to 13 Percent Growth in Total Revenues; Cement Product Gross Margin Expanded 680 Basis Points; Magnesia Specialties Business Posted Record Revenues; Company Expects Continued, Multi-Year Construction Recovery; Raises 2018 Guidance
