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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
NuConomy [Member]
Dec. 31, 2012
Proficient [Member]
Dec. 31, 2011
Proficient [Member]
Dec. 31, 2010
Proficient [Member]
Dec. 31, 2012
Engage [Member]
Dec. 31, 2012
LookIO [Member]
Cash flows from operating activities:                  
Net income $ 6,355 $ 12,038 $ 9,259            
Adjustments to reconcile net income to net cash provided by operating activities:                  
Stock-based compensation expense 10,715 6,771 5,142            
Depreciation 7,329 6,563 5,791            
Amortization of intangibles 580 1,029 1,486            
Provision for doubtful accounts, net 20 290 166            
Deferred income taxes (2,871) 229 832            
Changes in operating assets and liabilities, net of acquisitions:                  
Accounts receivable (664) (4,798) (6,391)            
Prepaid expenses and other current assets (1,086) 665 (2,687)            
Deferred implementation costs 7 (84) (28)            
Security deposits (208) 146 (174)            
Other assets   116              
Accounts payable 2,920 1,451 45            
Accrued expenses 3,654 211 1,224            
Deferred revenue 1,258 447 884            
Net cash provided by operating activities 28,009 25,074 15,549            
Cash flows from investing activities:                  
Purchases of property and equipment, including capitalized software (11,221) (7,268) (8,002)            
Acquisition of business       (789) (77) (75) (95) (8,465) (900)
Acquisition of Amadesa technology assets (10,798)                
Net cash used in investing activities (31,461) (7,343) (8,886)            
Cash flows from financing activities:                  
Repurchase of common stock     (3,649)            
Excess tax benefit from the exercise of employee stock options 4,104 4,001 1,397            
Proceeds from issuance of common stock in connection with the exercise of options 9,406 10,280 11,484            
Net cash provided by financing activities 13,510 14,281 9,232            
Effect of foreign exchange rate changes on cash and cash equivalents 3 (70) (131)            
Net increase in cash and cash equivalents 10,061 31,942 15,764            
Cash and cash equivalents at the beginning of the period 93,278 61,336 45,572            
Cash and cash equivalents at the end of the period $ 103,339 $ 93,278 $ 61,336