CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 60,189	$ 45,232
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	15,919	13,293
Amortization	34,579	31,974
Amortization of original issue discount	2,099	1,984
Asset impairment	365	1,428
Gain on short-term investments and other	(285)	(65)
Loss on extinguishment of debt		810
Deferred income taxes	6,124	2,150
Stock-based compensation	13,295	14,805
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(8,748)	(15,952)
Other current and non-current assets and liabilities	(15,312)	(21,763)
Income taxes payable/receivable	3,468	5,365
Trade accounts payable and accrued liabilities	(7,978)	(13,174)
Deferred revenue	3,812	7,182
Net cash provided by operating activities	107,527	73,269
Cash flows from investing activities:
Purchases of software, property and equipment	(27,706)	(44,047)
Purchases of short-term investments	(25,446)	(53,285)
Proceeds from sale/maturity of short-term investments	38,029	190,467
Acquisition of and investments in business, net of cash acquired	(17,194)	(71,443)
Net cash provided by (used in) investing activities	(32,317)	21,692
Cash flows from financing activities:
Proceeds from issuance of common stock	1,630	1,701
Payment of cash dividends	(21,980)	(21,197)
Repurchase of common stock	(25,683)	(24,034)
Proceeds from long-term debt		150,000
Payments on long-term debt	(5,625)	(123,750)
Payments of deferred financing costs		(1,490)
Net cash used in financing activities	(51,658)	(18,770)
Effect of exchange rate fluctuations on cash	(2,199)	(1,262)
Net increase in cash and cash equivalents	21,353	74,929
Cash and cash equivalents, beginning of period	139,277	122,243
Cash and cash equivalents, end of period	160,630	197,172
Cash paid during the period for-
Interest	14,521	14,181
Income taxes	$ 11,779	$ 8,426