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Acquisitions | 6 Months Ended
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Jun. 30, 2019
Acquisitions | ​ 4. Acquisitions ​ Walker Acquisition ​ On April 1, 2019, we acquired all of the issued and outstanding equity interests of Walker TX Holding Company, LLC and each of its wholly owned subsidiaries (collectively “Walker”). As a result of the acquisition, Walker is a wholly owned subsidiary of the Company and reports as a separate operating location. Walker is a full-service electrical contracting and network infrastructure engineering business serving commercial and industrial clients with headquarters in Irving, Texas and operations throughout the state of Texas. Revenue attributable to Walker for the three and six months ended June 30, 2019 was $92.6 million. ​ The following summarizes the acquisition date fair value of consideration transferred and the acquisition date fair value of the identifiable assets acquired and liabilities assumed, including an amount for goodwill (in thousands): ​
​ | ​ | ​
Consideration transferred: | ​ | ​
Cash paid at closing | $ | 178,000
Advance to former owners | ​ | 20,500
Working capital adjustment | ​ | (7,594)
Notes issued to former owners | ​ | 25,000
Tax equalization payment | ​ | 202
Estimated fair value of contingent earn-out payments | ​ | 19,500
​ | $ | 235,608
Recognized amounts of identifiable assets acquired and liabilities assumed: | ​ | ​
Cash and cash equivalents | $ | 4,312
Billed and unbilled accounts receivable | ​ | 92,309
Other current assets | ​ | 8,225
Other long-term assets | ​ | 53
Property and equipment | ​ | 4,970
Goodwill | ​ | 96,801
Identifiable intangible assets | ​ | 90,200
Lease right-of-use asset | ​ | 10,495
Accounts payable | ​ | (19,682)
Accrued compensation and benefits | ​ | (974)
Billings in excess of costs and estimated earnings | ​ | (31,553)
Other current liabilities | ​ | (11,278)
Long-term lease liabilities | ​ | (8,270)
​ | $ | 235,608
​ The allocation of the purchase price to the assets acquired and liabilities assumed is preliminary and, therefore, subject to change pending the completion of the final valuation of intangible assets and accrued liabilities. Goodwill represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. All of the goodwill recognized as a result of this transaction is tax deductible. ​ In estimating the fair value of the acquired intangible assets, we utilized the valuation methodology determined to be the most appropriate for the individual intangible asset. In order to estimate the fair value of the backlog and customer relationships, we utilized an excess earnings methodology, which consisted of the projected cash flows attributable to these assets discounted to present value using a risk-adjusted discount rate that represented the required rate of return. The trade name value was determined based on the relief-from-royalty method, which applies a royalty rate to the revenue stream attributable to this asset, and the resulting royalty payment is tax effected and discounted to present value. Some of the more significant estimates and assumptions inherent in determining the fair value of the identifiable intangible assets are associated with forecasting cash flows and profitability, which represent Level 3 inputs. The primary assumptions used were generally based upon the present value of anticipated cash flows discounted at rates ranging from 8.5%-11.5%. Estimated years of projected earnings generally follow the range of estimated remaining useful lives for each intangible asset class. ​ The acquired intangible assets include the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Valuation Method | ​ | Estimated Useful Life | ​ | ​ | Estimated Fair Value
Backlog | ​ | Excess earnings | ​ | 2 years | ​ | $ | 4,600
Trade Names | ​ | Relief-from-royalty | ​ | 25 years | ​ | ​ | 32,600
Customer Relationships | ​ | Excess earnings | ​ | 10 years | ​ | ​ | 53,000
Total | ​ | ​ | ​ | ​ | ​ | $ | 90,200
​ The contingent earn-out obligation is associated with the achievement of specified earnings milestones over a five year period, and the range of estimated milestone payments is from $1 million to $11 million (undiscounted). We determined the initial fair value of the contingent earn-out obligation based on the Monte Carlo Simulation method, which represents a Level 3 measurement. Cash flows were discounted using a 10.2% discount rate, which we believe is appropriate and representative of a market participant assumption. Subsequent to the acquisition date, we will measure the contingent earn-out obligation at fair value each reporting period. Future changes in the estimated fair value of the contingent payments will be recognized immediately in earnings. ​ Pro Forma Impact of the Acquisition ​ The following unaudited pro forma information presents the consolidated results of the Company and Walker for the three and six months ended June 30, 2019 and 2018, with adjustments to give effect to pro forma events that are directly attributable to the acquisition and have a continuing impact. The unaudited pro forma information is presented for illustrative purposes only and is not necessarily indicative of the results of operations of future periods or the results of operations that actually would have been realized had the entities been a single company during the periods presented or the results that the company will experience after the acquisition. The unaudited pro forma information does not give effect to the potential impact of current financial conditions, regulatory matters or any operating efficiencies that may be associated with the acquisition. ​ The unaudited pro forma consolidated results of operations, assuming the acquisition had occurred on January 1, 2018, are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | 2019 | 2018 | ​ | 2019 | ​ | 2018
Revenue | $ | 650,302 | ​ | $ | 632,467 | ​ | $ | 1,277,136 | ​ | $ | 1,178,558
Pre-tax income | $ | 32,578 | ​ | $ | 48,737 | ​ | $ | 56,505 | ​ | $ | 65,418
​ Other Acquisitions ​ In addition to the Walker acquisition, we completed one acquisition in the first quarter of 2019 and one acquisition in the second quarter of 2019 with a total purchase price of $2.6 million for the six months ended June 30, 2019. We completed two acquisitions in the first quarter of 2018, three acquisitions in the second quarter of 2018 and two acquisitions in the third quarter of 2018. One acquisition completed in the third quarter of 2018 reports as a separate operating location and the remainder were “tucked-in” with existing operations. Our consolidated Balance Sheet includes preliminary allocations of the purchase price to the assets acquired and liabilities assumed pending the completion of the final valuation of intangible assets and accrued liabilities. ​ The results of operations of acquisitions are included in our consolidated financial statements from their respective acquisition dates. Our consolidated Balance Sheet includes preliminary allocations of the purchase price to the assets acquired and liabilities assumed for the applicable acquisitions pending the completion of the final valuation of intangible assets and accrued liabilities. Excluding the Walker acquisition, the acquisitions completed in the current and prior year were not material, individually or in the aggregate. Additional contingent purchase price (“earn-out”) has been or will be paid if certain acquisitions achieve predetermined profitability targets. Such earn-outs, which are not subject to the continued employment of the sellers, are estimated as of the purchase date and included as part of the consideration paid for the acquisition. If we have an earn-out for which continued employment is a condition to receive payment, then the earn-out is recorded as compensation expense over the period earned.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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