CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Contract revenues	$ 276,488	$ 228,877	$ 520,636	$ 444,515
Contract costs	244,752	198,349	459,526	386,907
Gross profit	31,736	30,528	61,110	57,608
Selling, general and administrative expenses	18,947	18,110	37,539	34,985
Amortization of intangible assets	84	83	167	167
Gain on sale of property and equipment	(319)	(60)	(1,217)	(71)
Income from operations	13,024	12,395	24,621	22,527
Other income (expense)
Interest income	8	30	15	33
Interest expense	(187)	(177)	(366)	(355)
Other, net	(31)	108	(89)	162
Income before provision for income taxes	12,814	12,356	24,181	22,367
Income tax expense	4,740	4,615	8,935	8,354
Net income	$ 8,074	$ 7,741	$ 15,246	$ 14,013
Income per common share:
— Basic (in dollars per share)	$ 0.39	$ 0.36	$ 0.73	$ 0.66
— Diluted (in dollars per share)	$ 0.38	$ 0.36	$ 0.72	$ 0.64
Weighted average number of common shares and potential common shares outstanding:
— Basic (in shares)	20,760	21,115	20,662	21,108
— Diluted (in shares)	21,215	21,631	21,135	21,600
Net income	$ 8,074	$ 7,741	$ 15,246	$ 14,013
Other comprehensive income:
Foreign currency translation adjustment	(8)	0	19	0
Other comprehensive income (loss)	(8)	0	19	0
Total comprehensive income	$ 8,066	$ 7,741	$ 15,265	$ 14,013