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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Total revenue | $ 139,531 | $ 117,838 | $ 260,080 | $ 233,028
Total gross profit | 15,798 | 15,538 | 29,085 | 29,306
Total selling, general and administrative expenses | 13,685 | 12,787 | 29,351 | 27,353
Amortization of intangibles | 336 | 1,016 | 671 | 2,024
Operating Income | 1,777 | 1,735 | (937) | (71)
Operating income for reportable segments | 1,777 | 1,735 | (937) | (71)
Interest expense, net | (799) | (563) | (1,568) | (1,017)
Gain (loss) on sale of property and equipment | 24 | (99) | 40 | (136)
Total unallocated amounts | (775) | (662) | (1,528) | (1,153)
Total consolidated income before income taxes | 1,002 | 1,073 | (2,465) | (1,224)
Depreciation and amortization | 1,427 | 2,712 | 2,798 | 5,359
Construction [Member] |  |  |  |
Total revenue | 113,735 | 96,221 | 210,545 | 187,686
Total gross profit | 9,501 | 10,979 | 18,772 | 19,928
Total selling, general and administrative expenses | 6,696 | 5,172 | 14,455 | 12,453
Depreciation and amortization | 704 | 1,001 | 1,370 | 1,979
Service [Member] |  |  |  |
Total revenue | 25,796 | 21,617 | 49,535 | 45,342
Total gross profit | 6,297 | 4,559 | 10,313 | 9,378
Total selling, general and administrative expenses | 3,345 | 3,551 | 7,471 | 7,002
Depreciation and amortization | 192 | 503 | 372 | 992
Corporate [Member] |  |  |  |
Total selling, general and administrative expenses | 3,644 | 4,064 | 7,425 | 7,898
Depreciation and amortization | $ 531 | $ 1,208 | $ 1,056 | $ 2,388

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