Business Combination

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Business Combination

10.Business Combination

During the quarter ended March 31, 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.  Specific accounts subject to ongoing purchase accounting include property, plant and equipment; goodwill; other intangible assets; deferred income taxes and accrued expenses.  The acquisition was not financially material and therefore pro forma information is not required.