Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash flows from operating activities:
Net income	$ 12,891	$ 20,247	$ 18,789
Adjustments to reconcile net income to net cash provided by operating activities:
(Gain) loss on change in fair value of contingent consideration, net	(1,620)	136	371
Depreciation and amortization	6,974	6,462	7,865
Non-cash compensation expense	6,314	6,015	6,059
Deferred income taxes	(313)	(1,761)	(1,096)
Changes in other operating items, net of acquired amounts:
Accounts and other receivables	(10,977)	(17,965)	6,497
Costs and estimated earnings in excess of billings on uncompleted contracts	(1,893)	4,234	(16,942)
Prepaid expenses and other current assets	(2,297)	(2,490)	5,111
Accounts payable and accrued expenses	15,392	3,732	3,856
Billings in excess of costs and estimated earnings on uncompleted contracts	2,520	383	(4,663)
Income tax benefit from stock-based compensation	0	(137)	(835)
Contingent consideration payments in excess of fair value on acquisition date	(408)	(539)	(325)
Other	(323)	(240)	867
Net cash provided by operating activities	26,260	18,077	25,554
Cash flows from investing activities:
Additions to property, plant and equipment	(2,734)	(1,402)	(2,357)
Acquisitions, net of cash acquired	(11,111)	(6,801)	0
Investment in joint venture	0	(1,600)	0
Capitalized software development costs	(1,313)	(933)	0
Other investing activities	(295)	14	186
Net cash used in investing activities	(15,453)	(10,722)	(2,171)
Cash flows from financing activities:
Proceeds from (repayment of) short-term borrowings	19,864	(16,127)	13,285
Proceeds from long-term debt	0	40,000	0
Repayment of long-term debt	(12,000)	(24,444)	(13,333)
Contingent consideration payments	(4,657)	(2,244)	(2,284)
Change in negative cash book balance	(2,138)	1,366	(1,143)
Repurchases of common stock	(3,773)	(8,747)	(11,559)
Income tax benefit from stock-based compensation	0	137	835
Tax withholding payments for employee stock-based compensation in exchange for shares surrendered	(1,168)	(771)	(1,451)
Premium paid on interest rate cap	(474)	0	0
Other financing activities	120	48	138
Net cash used in financing activities	(4,226)	(10,782)	(15,512)
Effect of exchange rate changes on cash	685	(1,257)	(1,382)
Net change in cash	7,266	(4,684)	6,489
Cash at beginning of year	16,346	21,030	14,541
Cash at end of year	23,612	16,346	21,030
Cash paid during the year for:
Interest	1,841	1,523	1,383
Income taxes	6,256	10,604	8,273
Non-cash financing activities:
Accrued share repurchases	529	0	788
Accrued contingent consideration	$ 5,613	$ 5,166	$ 0