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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
Schedule of cash paid | Cash paid (in thousands) for:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
Interest | ​ | $ | 8,817 | ​ | $ | 3,743 | ​ | $ | 2,832 | ​
Income taxes | ​ | $ | 45,288 | ​ | $ | 33,401 | ​ | $ | 38,144 | ​
Schedule of contracts in progress | Contracts in progress are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2019 |  | 2018 |
Costs incurred on contracts in progress | ​ | $ | 2,518,581 | ​ | $ | 1,574,460 | ​
Estimated earnings, net of losses | ​ |  | 405,891 | ​ |  | 300,514 | ​
Less—Billings to date | ​ |  | (3,033,112) | ​ |  | (1,958,567) | ​
Less—Unbilled accounts receivable | ​ | ​ | (55,542) | ​ | ​ | (37,180) | ​
​ | ​ | $ | (164,182) | ​ | $ | (120,773) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Costs and estimated earnings in excess of billings | ​ | $ | 2,736 | ​ | $ | 10,213 | ​
Billings in excess of costs and estimated earnings | ​ |  | (166,918) | ​ |  | (130,986) | ​
​ | ​ | $ | (164,182) | ​ | $ | (120,773) | ​
Schedule of disaggregation of revenue | Our consolidated 2019 revenue was derived from contracts to provide service activities in the mechanical and electrical services segments we serve. Refer to Note 14 – Segment Information for additional information on our reportable segments. We disaggregate our revenue from contracts with customers by activity, customer type and contract type, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the following tables (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
Revenue by Service Provided |  |  | 2019 | ​ |  | 2018 | ​ | ​ | 2017 | ​
Mechanical Services | ​ | ​ | $ | 2,251,560 |  | 86.1 | % | ​ | $ | 2,176,223 |  | 99.7 | % | ​ | $ | 1,787,922 | ​ | 100.0 | %
Electrical Services | ​ | ​ | ​ | 363,717 | ​ | 13.9 | % | ​ | ​ | 6,656 | ​ | 0.3 | % | ​ | ​ | — | ​ | — | ​
Total | ​ | ​ | $ | 2,615,277 | ​ | 100.0 | % | ​ | $ | 2,182,879 | ​ | 100.0 | % | ​ | $ | 1,787,922 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
Revenue by Type of Customer | ​ | ​ | 2019 | ​ | ​ | 2018 |  | ​ | 2017 |
Industrial | ​ | ​ | $ | 886,668 | ​ | 33.9 | % | ​ | $ | 596,557 | ​ | 27.3 | % | ​ | $ | 395,362 | ​ | 22.1 | %
Education | ​ | ​ | ​ | 412,318 | ​ | 15.8 | % | ​ | ​ | 391,937 | ​ | 18.0 | % | ​ | ​ | 351,808 | ​ | 19.7 | %
Office Buildings | ​ | ​ | ​ | 348,640 | ​ | 13.3 | % | ​ | ​ | 288,090 | ​ | 13.2 | % | ​ | ​ | 248,604 | ​ | 13.9 | %
Healthcare | ​ | ​ | ​ | 358,155 | ​ | 13.7 | % | ​ | ​ | 319,958 | ​ | 14.7 | % | ​ | ​ | 224,643 | ​ | 12.6 | %
Government | ​ | ​ | ​ | 162,507 | ​ | 6.2 | % | ​ | ​ | 143,958 | ​ | 6.6 | % | ​ | ​ | 140,843 | ​ | 7.9 | %
Retail, Restaurants and Entertainment | ​ | ​ | ​ | 248,083 | ​ | 9.5 | % | ​ | ​ | 225,348 | ​ | 10.3 | % | ​ | ​ | 223,593 | ​ | 12.5 | %
Multi-Family and Residential | ​ | ​ | ​ | 104,693 | ​ | 4.0 | % | ​ | ​ | 136,075 | ​ | 6.2 | % | ​ | ​ | 116,844 | ​ | 6.5 | %
Other | ​ | ​ | ​ | 94,213 | ​ | 3.6 | % | ​ | ​ | 80,956 | ​ | 3.7 | % | ​ | ​ | 86,225 | ​ | 4.8 | %
Total | ​ | ​ | $ | 2,615,277 | ​ | 100.0 | % | ​ | $ | 2,182,879 | ​ | 100.0 | % | ​ | $ | 1,787,922 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
Revenue by Activity Type | ​ | ​ | 2019 | ​ | ​ | 2018 |  | ​ | 2017 | ​
New Construction | ​ | ​ | $ | 1,201,122 | ​ | 45.9 | % | ​ | $ | 829,978 | ​ | 38.0 | % | ​ | $ | 684,687 | ​ | 38.3 | %
Existing Building Construction | ​ | ​ | ​ | 793,159 | ​ | 30.3 | % | ​ | ​ | 796,946 | ​ | 36.5 | % | ​ | ​ | 580,737 | ​ | 32.4 | %
Service Projects | ​ | ​ | ​ | 231,228 | ​ | 8.9 | % | ​ | ​ | 206,506 | ​ | 9.5 | % | ​ | ​ | 197,703 | ​ | 11.1 | %
Service Calls, Maintenance and Monitoring | ​ | ​ | ​ | 389,768 | ​ | 14.9 | % | ​ | ​ | 349,449 | ​ | 16.0 | % | ​ | ​ | 324,795 | ​ | 18.2 | %
Total | ​ | ​ | $ | 2,615,277 | ​ | 100.0 | % | ​ | $ | 2,182,879 | ​ | 100.0 | % | ​ | $ | 1,787,922 | ​ | 100.0 | %
Schedule of contract assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2019 | ​ | 2018
​ | Contract |  | Contract | ​ | Contract |  | Contract
​ | Assets | ​ | Liabilities | ​ | Assets | ​ | Liabilities
Balance at beginning of period | $ | 10,213 | ​ | $ | 130,986 | ​ | $ | 30,116 | ​ | $ | 106,005
Change due to acquisitions / disposals | ​ | 6,573 | ​ | ​ | 31,556 | ​ | ​ | 2,833 | ​ | ​ | 8,195
Change due to conditional versus unconditional | ​ | (14,050) | ​ | ​ | — | ​ | ​ | 6,244 | ​ | ​ | —
Reclassified to unbilled accounts receivable | ​ | — | ​ | ​ | — | ​ | ​ | (28,980) | ​ | ​ | —
Change in timing for performance obligation to be satisfied | ​ | — | ​ | ​ | 4,376 | ​ | ​ | — | ​ | ​ | 16,786
Balance at end of period | $ | 2,736 | ​ | $ | 166,918 | ​ | $ | 10,213 |  | $ | 130,986
Schedule of lease assets and liabilities | The following table summarizes the lease assets and liabilities included in the consolidated Balance Sheet as follows (in thousands): ​
​ | ​ | ​
​ | December 31, 2019
Lease right-of-use assets | $ | 84,073
Lease liabilities: | ​ | ​
Other current liabilities | ​ | 14,016
Long-term lease liabilities | ​ | 72,697
Total lease liabilities | $ | 86,713
Schedule of maturities of lease liabilities | The maturities of lease liabilities as of December 31, 2019 are as follows (in thousands): ​
​ | ​ | ​ | ​
Year ending December 31— | ​ | ​ | ​
2020 | ​ | $ | 17,124
2021 | ​ | ​ | 15,096
2022 | ​ | ​ | 12,873
2023 | ​ | ​ | 10,797
2024 | ​ | ​ | 9,222
Thereafter | ​ | ​ | 36,954
Total Lease Payments | ​ | ​ | 102,066
Less—Present Value Discount | ​ | ​ | (15,353)
Present Value of Lease Liabilities | ​ | $ | 86,713
Schedule of future minimum rental payments under noncancelable operating leases | The following table represents future minimum rental payments under noncancelable operating leases under ASC 840 as of December 31, 2018 (in thousands): ​
​ | ​ | ​ | ​
Year ending December 31— | ​ | ​ |
2019 |  | $ | 13,503
2020 | ​ |  | 10,768
2021 | ​ |  | 9,449
2022 | ​ |  | 7,707
2023 | ​ |  | 6,402
Thereafter | ​ |  | 28,328
​ | ​ | $ | 76,157
Schedule of supplemental information related to leases | Supplemental information related to leases was as follows (in thousands): ​
​ | ​ | ​
​ | Year Ended
​ | December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities | $ | 16,895
Lease right-of-use assets obtained in exchange for lease liabilities | $ | 26,811

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