CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 45,446	$ 60,189
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	17,016	15,919
Amortization	32,998	34,579
Amortization of original issue discount	2,221	2,099
Asset impairment	10,438	365
Gain on short-term investments and other	(120)	(285)
Deferred income taxes	3,844	6,124
Stock-based compensation	14,088	13,295
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	13,322	(8,748)
Other current and non-current assets and liabilities	(9,228)	(15,312)
Income taxes payable/receivable	1,542	3,468
Trade accounts payable and accrued liabilities	(24,618)	(7,978)
Deferred revenue	8,736	3,812
Net cash provided by operating activities	115,685	107,527
Cash flows from investing activities:
Purchases of software, property and equipment	(24,201)	(27,706)
Purchases of short-term investments	(49,100)	(25,446)
Proceeds from sale/maturity of short-term investments	37,743	38,029
Acquisition of and investments in business, net of cash acquired	(11,491)	(17,194)
Net cash used in investing activities	(47,049)	(32,317)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,838	1,630
Payment of cash dividends	(23,441)	(21,980)
Repurchase of common stock	(19,926)	(25,683)
Payments on long-term debt	(7,500)	(5,625)
Net cash used in financing activities	(49,029)	(51,658)
Effect of exchange rate fluctuations on cash	(1,666)	(2,199)
Net increase in cash and cash equivalents	17,941	21,353
Cash and cash equivalents, beginning of period	156,548	139,277
Cash and cash equivalents, end of period	174,489	160,630
Cash paid during the period for-
Interest	12,941	14,521
Income taxes	$ 14,756	$ 11,779