CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 81,502	$ 84,338	$ 165,481	$ 183,571
Cost of revenue	67,436	78,533	145,714	173,318
Gross profit	14,066	5,805	19,767	10,253
General and administrative expenses	5,062	3,726	9,547	8,019
Operating income	9,004	2,079	10,220	2,234
Other income (expense):
Interest expense	(88)	(50)	(138)	(87)
Interest income	2	7	8	13
Other income, net	42	17	440	20
Total other income (expense)	(44)	(26)	310	(54)
Net income before income taxes	8,960	2,053	10,530	2,180
Income taxes	3,420	696	4,001	740
Net income	$ 5,540	$ 1,357	$ 6,529	$ 1,440
Per share data:
Basic and diluted earnings per share - common shareholders (usd per share)	$ 0.37	$ 0.09	$ 0.44	$ 0.10
Cash dividend declared per common share (usd per share)	$ 0.01	$ 0.10	$ 0.02	$ 0.20