CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 21,514	$ 19,251
Adjustments to reconcile net income to net cash provided by (used in) operating activities –
Depreciation	5,565	5,113
Amortization	10,788	11,949
Amortization of original issue discount	730	690
Asset impairment	259	69
Gain on short-term investments and other	(85)	(157)
Deferred income taxes	9,310	1,395
Stock-based compensation	4,857	3,693
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(23,304)	(12,018)
Other current and non-current assets and liabilities	(8,452)	(1,575)
Income taxes payable/receivable	(3,092)	3,886
Trade accounts payable and accrued liabilities	(32,455)	(25,594)
Deferred revenue	7,152	6,124
Net cash provided by (used in) operating activities	(7,213)	12,826
Cash flows from investing activities:
Purchases of software, property and equipment	(4,822)	(8,286)
Purchases of short-term investments	(16,037)	(14,168)
Proceeds from sale/maturity of short-term investments	18,670	19,619
Acquisition of and investments in business, net of cash acquired	(9,991)	(4,000)
Net cash used in investing activities	(12,180)	(6,835)
Cash flows from financing activities:
Proceeds from issuance of common stock	564	512
Payment of cash dividends	(8,277)	(7,641)
Repurchase of common stock	(13,876)	(13,568)
Payments on long-term debt	(1,875)	(1,875)
Net cash used in financing activities	(23,464)	(22,572)
Effect of exchange rate fluctuations on cash	(5,947)	876
Net decrease in cash and cash equivalents	(48,804)	(15,705)
Cash and cash equivalents, beginning of period	156,548	139,277
Cash and cash equivalents, end of period	107,744	123,572
Cash paid during the period for –
Interest	6,194	6,506
Income taxes	$ 857	$ 1,374