CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 62,567	$ 35,711	$ 45,268
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	14,776	14,084	18,633
Amortization	29,281	33,553	37,819
Amortization of original issue discount	6,246	5,781	5,352
Asset impairment	1,685
Loss on short-term investments and other	177	1,123	910
(Gain) loss on disposition of business operations	(3,733)	(222)	3,017
Loss on termination of pension plan			3,221
Deferred income taxes	(16,106)	41	(1,764)
Excess tax benefit of stock-based compensation awards	(2,185)	(2,060)	(677)
Stock-based employee compensation	21,130	16,655	14,796
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	1,831	(14,326)	(2,319)
Other current and non-current assets	(5,387)	(3,230)	(7,163)
Income taxes payable/receivable	8,953	(2,260)	10,639
Trade accounts payable and accrued liabilities	13,916	4,359	(994)
Deferred revenue	3,808	(5,558)	(104)
Net cash provided by operating activities	136,959	83,651	126,634
Cash flows from investing activities:
Purchases of property and equipment	(18,845)	(25,985)	(30,076)
Purchases of short-term investments	(181,553)	(190,427)	(183,575)
Proceeds from sale/maturity of short-term investments	192,994	197,466	89,688
Acquisition of and investment in businesses, net of cash acquired	(1,300)		(2,926)
Acquisition of and investments in client contracts	(8,018)	(5,600)	(7,092)
Proceeds from the disposition of business operations		1,130	4,530
Net cash used in investing activities	(16,722)	(23,416)	(129,451)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,547	1,394	1,591
Payment of cash dividends	(22,238)	(20,530)	(14,454)
Repurchase of common stock	(65,027)	(25,138)	(15,478)
Payments on acquired equipment financing	(829)	(1,097)	(2,723)
Proceeds from long-term debt	150,000
Payments on long-term debt	(127,500)	(15,000)	(15,000)
Payments of deferred financing costs	(2,742)
Excess tax benefit of stock-based compensation awards	2,185	2,060	677
Net cash used in financing activities	(64,604)	(58,311)	(45,387)
Effect of exchange rate fluctuations on cash	(4,714)	(2,898)	(2,857)
Net increase (decrease) in cash and cash equivalents	50,919	(974)	(51,061)
Cash and cash equivalents, beginning of year	81,712	82,686	133,747
Cash and cash equivalents, end of year	132,631	81,712	82,686
Cash paid during the year for-
Interest	8,380	8,265	9,440
Income taxes	$ 41,860	$ 25,153	$ 6,149