Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 2,632	$ 4,086
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on change in fair value of contingent consideration, net	(2,552)	(197)
Depreciation and amortization	1,842	1,443
Deferred income taxes	(108)	118
Non-cash compensation expense	1,409	1,458
Changes in other operating items:
Accounts and other receivables	12,817	5,753
Increase (Decrease) in Unbilled Receivables	227	(7,570)
Prepaid expenses and other current assets	(6,024)	(330)
Accounts payable and accrued expenses	1,643	(2,481)
Increase (Decrease) in Deferred Revenue	(2,485)	2,047
Other	5	(209)
Net cash provided by operating activities	9,406	4,118
Cash flows from investing activities:
Additions to property, plant and equipment	(370)	(525)
Acquisitions, net of cash acquired	(10,000)	(3,193)
Other investing activities	(834)	(344)
Net cash used in investing activities	(11,204)	(4,062)
Cash flows from financing activities:
Proceeds from short-term borrowings	6,022	5,820
Repayment of long-term debt	(3,000)	(3,000)
Change in negative cash book balance	(261)	(2,313)
Repurchases of common stock in the open market	(7,790)	(1,674)
Other financing activities	(50)	(134)
Net cash used in financing activities	(5,079)	(1,301)
Effect of exchange rate changes on cash and cash equivalents	210	351
Net decrease in cash	(6,667)	(894)
Cash at beginning of period	23,612	16,346
Cash at end of period	16,945	15,452
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	624	175
Cash paid during the period for income taxes	$ 1,460	$ 491