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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Contract revenues	$ 339,676	$ 356,185	$ 685,287	$ 656,314
Contract costs	301,046	328,668	610,904	603,057
Gross profit	38,630	27,517	74,383	53,257
Selling, general and administrative expenses	29,168	25,024	57,448	50,803
Amortization of intangible assets	119	210	236	398
Gain on sale of property and equipment	(1,014)	(1,319)	(2,065)	(2,026)
Income from operations	10,357	3,602	18,764	4,082
Other income (expense)
Interest income	0	3	0	4
Interest expense	(783)	(594)	(1,504)	(1,108)
Other, net	25	751	274	1,625
Income before provision for income taxes	9,599	3,762	17,534	4,603
Income tax expense	2,764	2,532	5,055	2,173
Net income	$ 6,835	$ 1,230	$ 12,479	$ 2,430
Income per common share:
- Basic (in dollars per share)	$ 0.42	$ 0.08	$ 0.76	$ 0.15
- Diluted (in dollars per share)	$ 0.41	$ 0.07	$ 0.75	$ 0.15
Weighted average number of common shares and potential common shares outstanding:
- Basic (in shares)	16,455	16,312	16,388	16,237
- Diluted (in shares)	16,592	16,503	16,555	16,476
Net income	$ 6,835	$ 1,230	$ 12,479	$ 2,430
Other comprehensive income (loss):
Foreign currency translation adjustment	16	59	(1)	10
Other comprehensive income (loss)	16	59	(1)	10
Total comprehensive income	$ 6,851	$ 1,289	$ 12,478	$ 2,440

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Amount of income (expense) related to nonoperating activities, classified as other.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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