Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 71,378	$ 59,019	$ 38,822
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,514	6,038	3,955
Provision for doubtful accounts	976	1,143	321
Provision for deferred taxes	(5,083)	(1,752)	(2,615)
Unrealized foreign exchange gain on forward contracts	2,346	(1,304)	(500)
Unrealized foreign exchange gain	(5,795)	(598)	0
Unrealized gain on put option	(537)	(6,059)	(89)
Share-based compensation	2,205	1,850	1,369
Debt discount amortization on convertible debt	21	327	0
Reduction of acquisition earnout	(2,847)	(1,500)	0
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(2,903)	(3,018)	(8,619)
Other assets	1,647	(955)	(577)
Accounts payable and accrued expenses	1,525	(356)	1,127
Accrued payroll and related benefits	(532)	165	587
Deferred rent	(261)	(125)	27
Other liabilities	836	(61)	109
Deferred revenue	796	(35)	(40)
Net cash provided by operating activities	71,286	52,779	33,877
Cash flows from investing activities:
Purchases of marketable securities	(3,098)	(11,507)	(4,133)
Maturities of marketable securities	7,600	7,006	3,870
Capital expenditures	(2,829)	(1,754)	(3,129)
Net cash used in investing activities	(13,320)	(24,406)	(47,427)
Cash flows from financing activities:
Proceeds from / Repayments to line of credit, net	6,750	1,900	(1,846)
Proceeds from term loan	16,250	10,157	0
Proceeds from the issuance of convertible debt	0	0	25,000
Principal payments of term loan obligation	(6,407)	(5,000)	0
Repurchase of common stock	(63,659)	(10,650)	(505)
Settlement on conversion of convertible debt	(6,761)	(22,521)	0
Payments of long term debt	0	0	(742)
Payments for capital lease obligations	(300)	(804)	(293)
Proceeds from exercise of common stock options	51	1,236	1,565
Dividends paid	(1,461)	0	0
Net cash provided by financing activities	(55,537)	(25,682)	23,179
Effect of foreign exchange rates on cash and cash equivalents	(2,130)	1,479	123
Net change in cash and cash equivalents	299	4,170	9,752
Cash and cash equivalents at the beginning of the year	23,397	19,227	9,475
Cash and cash equivalents at the end of the year	23,696	23,397	19,227
Supplemental disclosures of cash flow information:
Interest paid	710	526	1,125
Income taxes paid	3,796	2,396	4,752
ADAM
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	3,529	0	0
MCN
Cash flows from investing activities:
Investment, net of cash acquired	(381)	(2,931)	0
Trades Monitor
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	(2,749)	0
Connective Technologies
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	(1,337)	0
USIX
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	(7,131)	0
E-Trek
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	(1,011)	0
IDS
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	0	(1,000)
Health Connect Systems [Member]
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(17,945)	0	0
Periculum
Cash flows from investing activities:
Investment, net of cash acquired	0	(6)	(200)
Acclamation
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	0	(85)
ConfirmNet
Cash flows from investing activities:
Investment, net of cash acquired	(184)	(2,975)	(3,279)
Facts
Cash flows from investing activities:
Investment, net of cash acquired	(12)	(11)	(6,215)
Peak Performance
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	0	(7,894)
EZ Data
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	$ 0	$ 0	$ (25,362)