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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | $ 6,907 |
Impact of new accounting standard | 695 |
Bad debt expense (benefit) | 4,551 | $ 235
Deductions for uncollectible receivables written off, net of recoveries | (240) |
Credit allowance of acquired companies on the acquisition date | 352 |
Purchase accounting adjustments | 72 |
Reclass to other current liabilities | (315) |
Balance at March 31, 2020 | 12,022 |
Service |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 3,192 |
Impact of new accounting standard | 310 |
Bad debt expense (benefit) | 2,754 |
Deductions for uncollectible receivables written off, net of recoveries | (234) |
Balance at March 31, 2020 | 6,022 |
Construction |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 3,400 |
Impact of new accounting standard | 331 |
Bad debt expense (benefit) | 1,797 |
Deductions for uncollectible receivables written off, net of recoveries | (6) |
Credit allowance of acquired companies on the acquisition date | 352 |
Purchase accounting adjustments | 72 |
Balance at March 31, 2020 | 5,946 |
Other. |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 315 |
Impact of new accounting standard | 54 |
Reclass to other current liabilities | (315) |
Balance at March 31, 2020 | $ 54 |

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable from change in methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447 + Details
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