CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 82,770	$ 66,130	$ 61,364
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	21,422	18,304	13,380
Amortization	45,700	44,328	29,501
Amortization of original issue discount	2,819	2,664	2,790
Asset impairment	438	1,851	3,135
Gain on short-term investments and other	(364)	(101)	(184)
Loss on extinguishment of debt		810
Deferred income taxes	(77)	4,913	7,112
Stock-based compensation	19,919	19,358	21,049
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(4,015)	(138)	(6,421)
Other current and non-current assets and liabilities	(17,727)	(23,179)	2,875
Income taxes payable/receivable	4,771	5,055	(2,729)
Trade accounts payable and accrued liabilities	(10,317)	(7,146)	(4,377)
Deferred revenue	5,737	10,492	(300)
Net cash provided by operating activities	151,076	143,341	127,195
Cash flows from investing activities:
Purchases of software, property and equipment	(37,319)	(57,104)	(28,942)
Purchases of short-term investments	(54,258)	(75,022)	(182,247)
Proceeds from sale/maturity of short-term investments	52,135	190,778	193,465
Acquisition of and investments in business, net of cash acquired	(17,194)	(144,791)
Acquisition of and investments in client contracts			(12,180)
Net cash used in investing activities	(56,636)	(86,139)	(29,904)
Cash flows from financing activities:
Proceeds from issuance of common stock	2,227	2,311	1,776
Payment of cash dividends	(29,126)	(27,979)	(26,850)
Repurchase of common stock	(30,918)	(34,726)	(30,649)
Exercise of common stock warrants	(12,911)
Proceeds from long-term debt		150,000
Payments on long-term debt	(7,500)	(125,625)	(15,000)
Settlement of convertible notes			(34,771)
Payments of deferred financing costs		(1,490)
Net cash used in financing activities	(78,228)	(37,509)	(105,494)
Effect of exchange rate fluctuations on cash	1,059	(2,659)	4,095
Net increase (decrease) in cash and cash equivalents	17,271	17,034	(4,108)
Cash and cash equivalents, beginning of period	139,277	122,243	126,351
Cash and cash equivalents, end of period	156,548	139,277	122,243
Cash paid during the period for-
Interest	16,064	15,857	14,729
Income taxes	$ 18,358	$ 10,426	$ 22,144