Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 51,351	$ 48,879	$ 42,282
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	18,633	22,286	25,435
Amortization	37,819	44,178	42,173
Amortization of original issue discount	5,352	4,954	5,206
Impairment of client contract		3,783
(Gain) loss on short-term investments and other	910	(107)	(60)
Loss on disposition of business operations	3,017
Loss on termination of pension plan	3,221
Deferred income taxes	(1,764)	(10,707)	3,977
Excess tax benefit of stock-based compensation awards	(677)	(415)	(828)
Stock-based employee compensation	14,796	13,431	12,152
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(2,319)	(9,481)	(30,141)
Other current and non-current assets	(7,163)	(1,715)	1,799
Income taxes payable/receivable	4,556	(6,543)	7,573
Trade accounts payable and accrued liabilities	(994)	18,474	(20,074)
Deferred revenue	(104)	425	(28,535)
Net cash provided by operating activities	126,634	127,442	60,959
Cash flows from investing activities:
Purchases of property and equipment	(30,076)	(33,221)	(22,197)
Purchases of short-term investments	(183,575)	(65,355)	(37,798)
Proceeds from sale/maturity of short-term investments	89,688	42,063	43,450
Acquisition of businesses, net of cash acquired	(2,926)	(19,085)
Acquisition of and investments in client contracts	(7,092)	(4,629)	(9,133)
Proceeds from the disposition of business operations	4,530
Net cash used in investing activities	(129,451)	(80,227)	(25,678)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,591	1,896	1,486
Payment of cash dividends	(14,454)
Repurchase of common stock	(15,478)	(16,558)	(14,365)
Payments on acquired equipment financing	(2,723)	(1,698)	(1,587)
Proceeds from long-term debt		150,000
Payments on long-term debt	(15,000)	(190,000)	(70,149)
Payments of deferred financing costs		(2,450)	(205)
Excess tax benefit of stock-based compensation awards	677	415	828
Net cash used in financing activities	(45,387)	(58,395)	(83,992)
Effect of exchange rate fluctuations on cash	(2,857)	(1,806)	(2,414)
Net decrease in cash and cash equivalents	(51,061)	(12,986)	(51,125)
Cash and cash equivalents, beginning of period	133,747	146,733	197,858
Cash and cash equivalents, end of period	82,686	133,747	146,733
Cash paid during the period for-
Interest	9,440	13,124	13,921
Income taxes	$ 6,149	$ 43,739	$ 22,836