CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 19,251	$ 14,014
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	5,113	3,914
Amortization	11,949	9,946
Amortization of original issue discount	690	652
Asset impairment	69	339
Gain on short-term investments and other	(157)	(17)
Loss on extinguishment of debt		810
Deferred income taxes	1,395	4,017
Stock-based compensation	3,693	4,572
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(12,018)	25,459
Other current and non-current assets and liabilities	(1,575)	(4,629)
Income taxes payable/receivable	3,886	1,035
Trade accounts payable and accrued liabilities	(25,594)	(26,926)
Deferred revenue	6,124	(3,331)
Net cash provided by operating activities	12,826	29,855
Cash flows from investing activities:
Purchases of software, property and equipment	(8,286)	(12,235)
Purchases of short-term investments	(14,168)	(15,070)
Proceeds from sale/maturity of short-term investments	19,619	79,508
Acquisition of and investments in business, net of cash acquired	(4,000)	(68,636)
Net cash used in investing activities	(6,835)	(16,433)
Cash flows from financing activities:
Proceeds from issuance of common stock	512	484
Payment of cash dividends	(7,641)	(7,437)
Repurchase of common stock	(13,568)	(11,920)
Proceeds from long-term debt		150,000
Payments on long-term debt	(1,875)	(120,000)
Payments of deferred financing costs		(1,442)
Net cash provided by (used in) financing activities	(22,572)	9,685
Effect of exchange rate fluctuations on cash	876	2,153
Net increase (decrease) in cash and cash equivalents	(15,705)	25,260
Cash and cash equivalents, beginning of period	139,277	122,243
Cash and cash equivalents, end of period	123,572	147,503
Cash paid during the period for-
Interest	6,506	5,844
Income taxes	$ 1,374	$ 1,162