Business Combinations	9 Months Ended
Business Combinations	Sep. 30, 2021
Business Combinations [Abstract]
Business Combinations	Business combinations The following acquisitions were accounted for as business combinations in accordance with ASC 805 - Business Combinations. The results of the acquired businesses have been included in the Consolidated Financial Statements beginning on the acquisition date. Pro forma financial amounts reflecting the effects of the business combinations are not presented, as none of these business combinations, individually or in the aggregate, were material to the Company's financial position or results of operations. The acquisitions are also subject to customary adjustments based on, among other things, the amount of cash, debt and working capital in the business as of the closing date. The amounts included in the Consolidated Balance Sheets for these adjustments are considered provisional until final settlement has occurred. In 2021 and 2020, the construction materials and contracting segment's acquisitions included: •Mt. Hood Rock, a construction aggregates business in Oregon, acquired in April 2021. At September 30, 2021, the purchase price allocation was preliminary and will be finalized within 12 months of the acquisition date. •The assets of McMurry Ready-Mix Co., an aggregates and concrete supplier in Wyoming, acquired in December 2020. In the third quarter of 2021, the Company finalized the provisional accounting and recorded an immaterial measurement period adjustment. •The assets of Oldcastle Infrastructure Spokane, a prestressed-concrete business in Washington, acquired in February 2020. As of December 31, 2020, the purchase price adjustments had been settled with no material adjustments to the provisional accounting. In February 2020, the construction services segment acquired PerLectric, Inc., an electrical construction company in Virginia. As of March 31, 2021, the purchase price adjustments had been settled with no material adjustments to the provisional accounting. In 2021, the total purchase price for acquisitions was $13.8 million, subject to certain adjustments, with cash acquired totaling $100,000. The purchase price includes consideration paid of $13.7 million. The amounts allocated to the aggregated assets acquired and liabilities assumed during 2021 were as follows: $700,000 to current assets; $13.0 million to property, plant and equipment; $2.9 million to goodwill; $600,000 to other intangible assets; $200,000 to current liabilities; $100,000 to noncurrent liabilities - other and $3.2 million to deferred tax liabilities. The Company issued debt to finance the acquisitions. In 2020, the total purchase price for acquisitions was $110.2 million, subject to certain adjustments, with cash acquired totaling $1.7 million. The purchase price includes consideration paid of $106.0 million and $2.5 million of indemnity holdback liabilities. The amounts allocated to the aggregated assets acquired and liabilities assumed during 2020 were as follows: $54.8 million to current assets; $27.1 million to property, plant and equipment; $33.6 million to goodwill; $19.0 million to other intangible assets; $22.6 million to current liabilities; $300,000 to noncurrent liabilities - other and $1.4 million to asset retirement obligations. The Company issued debt to finance the acquisitions. Costs incurred for acquisitions are included in operation and maintenance expense on the Consolidated Statements of Income and were not material for the three or nine months ended September 30, 2021 and 2020.