Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 16,766	$ 15,437
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	3,619	3,322
Amortization	9,937	10,569
Deferred income taxes	481	(351)
Non-cash stock compensation and retirement savings plan contributions	10,395	9,807
Tax benefit from stock option exercises and restricted stock vesting	0	(974)
Adjustment to fair value of contingent consideration	(1,817)	273
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	12,877	7,830
Other assets	3,514	2,365
Accounts payable	(5,308)	(8,267)
Other liabilities	(10,565)	(13,759)
Net cash provided by operating activities	39,899	26,252
INVESTING ACTIVITIES
Purchase of property and equipment	(3,575)	(2,462)
Capitalization of internally developed software costs	(1,761)	(819)
Purchase of short-term investments	(869)	0
Purchase of business, net of cash acquired	(277)	(26,605)
Net cash used in investing activities	(6,482)	(29,886)
FINANCING ACTIVITIES
Proceeds from line of credit	153,000	201,500
Payments on line of credit	(181,000)	(194,500)
Payment of credit facility financing fees	(194)	(193)
Payment of contingent consideration for purchase of business	(2,144)	0
Tax benefit from stock option exercises and restricted stock vesting	0	974
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	154	284
Purchases of treasury stock	0	(2,840)
Remittance of taxes withheld as part of a net share settlement of restricted stock vesting	(2,530)	(3,644)
Net cash (used in) provided by financing activities	(32,714)	1,581
Effect of exchange rate on cash and cash equivalents	(193)	(190)
Change in cash and cash equivalents	510	(2,243)
Cash and cash equivalents at beginning of period	8,811	10,935
Cash and cash equivalents at end of period	9,321	8,692
Supplemental disclosures:
Cash paid for income taxes	2,587	4,835
Cash paid for interest	1,211	1,487
Non-cash activity:
Stock issued for purchase of business	96	12,493
Stock surrendered by Zeon in conjunction with net working capital settlement	1,499	0
Liability incurred for purchase of property, plant and equipment	1,671	0
Current liability assumed for prepaid asset	$ 0	$ 761