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Goodwill and Other Intangible Assets	12 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2018
Goodwill and Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	6. Goodwill and Other Intangible Assets As of December 31, 2018, 2017 and 2016, the Company had $585.0 million of goodwill allocated to its reporting units as follows: Civil, $415.3 million; Building, $13.5 million; and Specialty Contractors, $156.2 million. The balances presented include historical accumulated impairment of $76.7 million for the Civil reporting unit and $411.3 million for the Building reporting unit. In addition, as of December 31, 2018 and 2017, the Company had the following: (1) non-amortizable trade names with a carrying value of $50.4 million; (2) amortizable trade names with a gross carrying value of $51.1 million and accumulated amortization as of December 31, 2018 and 2017 of $18.8 million and $16.3 million, respectively; and (3) amortizable customer relationships with a gross carrying value of $23.2 million and accumulated amortization as of December 31, 2018 and 2017 of $20.0 million and $18.9 million, respectively. Amortization expense related to amortizable intangible assets was $3.5 million for each of the years ended December 31, 2018, 2017 and 2016. Future amortization expense related to amortizable intangible assets will be approximately $3.5 million per year for the years 2019 through 2021, $2.6 million for the year 2022 and $2.5 million for the year 2023. The weighted-average amortization period for amortizable trade names and customer relationships is 20 years and 12 years, respectively.