Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 6,207	$ 9,949
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on change in fair value of contingent consideration, net	(3,446)	(101)
Depreciation and amortization	3,761	3,206
Deferred income taxes	(169)	(433)
Non-cash compensation expense	2,534	3,192
Changes in other operating items:
Accounts and other receivables	10,568	7,435
Unbilled revenue	(2,753)	(5,153)
Prepaid expenses and other current assets	(1,755)	(1,815)
Accounts payable and accrued expenses	(1,775)	4,732
Deferred revenue	(7,067)	(1,092)
Other	1,020	(162)
Net cash provided by operating activities	7,125	19,758
Cash flows from investing activities:
Additions to property, plant and equipment	(1,514)	(1,769)
Acquisitions, net of cash acquired	(39,957)	(6,384)
Other investing activities	(2,051)	(844)
Net cash used in investing activities	(43,522)	(8,997)
Cash flows from financing activities:
Proceeds from short-term borrowings	24,197	6,727
Proceeds from long-term debt	18,000	0
Repayment of long-term debt	(6,000)	(6,000)
Change in negative cash book balance	(695)	(2,232)
Repurchases of common stock in the open market	(7,823)	(2,419)
Premium paid for interest rate cap	0	(474)
Other financing activities	(80)	(131)
Net cash provided by (used in) financing activities	27,599	(4,529)
Effect of exchange rate changes on cash and cash equivalents	(680)	1,136
Net increase (decrease) in cash	(9,478)	7,368
Cash at beginning of period	23,612	16,346
Cash at end of period	14,134	23,714
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	1,388	906
Cash paid during the period for income taxes	3,371	2,806
Business Acquisition and Contingent Consideration At Fair Value Noncurrent	$ 905	$ 4,725