Business Combination

6 Months Ended

Jun. 30, 2016

Business Combinations [Abstract]

Business Combination

10.Business Combination

During the first quarter 2016, the Corporation acquired the outstanding stock of Rocky Mountain Materials and Asphalt, Inc., and Rocky Mountain Premix Inc.  The acquisition provides more than 500 million tons of mineral reserves and expands the Corporation’s presence along the Front Range of the Rocky Mountains, home to 80% of Colorado’s population.  The acquired operations are reported through the West Group.  The Corporation has recorded preliminary fair values of the assets acquired and liabilities assumed; however, certain amounts are subject to change as additional reviews are performed, including asset and liability verification and review of seller’s final tax return.  Specific accounts subject to ongoing purchase accounting include property, plant and equipment; goodwill; accrued expenses and deferred income taxes.  The acquisition was not financially material; therefore, pro forma information is not required.