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Estimated Useful Life (Details)
12 Months Ended
Dec. 31, 2016
Building and improvements  
Property, Plant and Equipment, Estimated Useful Lives 35 years
Office furnishings, leasehold improvements, computer equipment and computer software  
Property, Plant and Equipment, Estimated Useful Lives 3-7 years
Transportation and construction equipment  
Property, Plant and Equipment, Estimated Useful Lives 5-25 years