CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 31,880	$ 38,630
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	11,199	10,554
Amortization	22,043	24,625
Amortization of original issue discount	1,470	1,390
Asset impairment	10,595	365
Gain on short-term investments and other	(110)	(170)
Deferred income taxes	6,771	4,181
Stock-based compensation	10,112	8,500
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(6,286)	(31,751)
Other current and non-current assets and liabilities	(8,951)	(16,222)
Income taxes payable/receivable	1,332	(315)
Trade accounts payable and accrued liabilities	(36,381)	(17,328)
Deferred revenue	6,803	5,970
Net cash provided by operating activities	50,477	28,429
Cash flows from investing activities:
Purchases of software, property and equipment	(14,334)	(17,858)
Purchases of short-term investments	(35,112)	(22,542)
Proceeds from sale/maturity of short-term investments	34,185	28,753
Acquisition of and investments in business, net of cash acquired	(9,991)	(4,000)
Net cash used in investing activities	(25,252)	(15,647)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,247	1,115
Payment of cash dividends	(15,856)	(14,808)
Repurchase of common stock	(14,515)	(20,741)
Payments on long-term debt	(4,687)	(3,750)
Net cash used in financing activities	(33,811)	(38,184)
Effect of exchange rate fluctuations on cash	(3,943)	(98)
Net decrease in cash and cash equivalents	(12,529)	(25,500)
Cash and cash equivalents, beginning of period	156,548	139,277
Cash and cash equivalents, end of period	144,019	113,777
Cash paid during the period for-
Interest	7,327	8,110
Income taxes	$ 2,865	$ 10,244