CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 38,899	$ 24,327
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	11,268	10,479
Amortization	22,353	25,207
Amortization of original issue discount	4,639	4,294
Gain on short-term investments and other	179	973
(Gain) loss on disposition of business operations	767	(222)
Deferred income taxes	(5,556)	(25)
Excess tax benefit of stock-based compensation awards	(2,174)	(2,044)
Stock-based employee compensation	15,775	12,250
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(1,869)	(15,559)
Other current and non-current assets	(6,092)	(5,866)
Income taxes payable/receivable	3,588	(1,825)
Trade accounts payable and accrued liabilities	(3,703)	(16,369)
Deferred revenue	6,272	286
Net cash provided by operating activities	84,346	35,906
Cash flows from investing activities:
Purchases of property and equipment	(16,776)	(21,406)
Purchases of short-term investments	(107,462)	(126,982)
Proceeds from sale/maturity of short-term investments	127,766	146,417
Acquisition of and investments in business, net of cash acquired	(962)
Acquisition of and investments in client contracts	(6,374)	(4,235)
Proceeds from the disposition of business operations		1,130
Net cash used in investing activities	(3,808)	(5,076)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,148	1,053
Payment of cash dividends	(16,811)	(15,461)
Repurchase of common stock	(64,995)	(11,456)
Payments on acquired asset financing	(829)	(1,097)
Proceeds from long-term debt	150,000
Payments on long-term debt	(125,625)	(11,250)
Payments of deferred financing costs	(2,742)
Excess tax benefit of stock-based compensation awards	2,174	2,044
Net cash used in financing activities	(57,680)	(36,167)
Effect of exchange rate fluctuations on cash	(4,405)	(1,776)
Net increase (decrease) in cash and cash equivalents	18,453	(7,113)
Cash and cash equivalents, beginning of period	81,712	82,686
Cash and cash equivalents, end of period	100,165	75,573
Cash paid during the period for-
Interest	7,484	7,331
Income taxes	$ 30,998	$ 21,718