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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue $ 50,496 $ 34,732
Expenses:    
Service costs 32,354 [1] 20,148 [1]
Sales and marketing 3,382 [1] 2,644 [1]
Product development 7,560 6,808
General and administrative 5,361 4,797
Amortization of intangible assets from acquisitions 403 [2] 1,055 [2]
Separation related costs   345
Total operating expenses 49,060 35,797
Gain on sales and disposals of intangible assets, net   1,362
Income from operations 1,436 297
Other income (expense):    
Interest income   3
Interest and line of credit expense (19) (19)
Other 17 (1)
Total other income (expense) (2) (17)
Income from continuing operations before provision for income taxes 1,434 280
Income tax expense 588 164
Net income from continuing operations 846 116
Discontinued operations, net of tax 9 (31)
Net income 855 85
Dividends paid to participating securities (36)  
Net income applicable to common stockholders 819 85
Basic and diluted net income per share applicable to Class A and Class B common stockholders:    
Continuing operations $ 0.02 $ 0.00
Discontinued operations, net of tax $ 0.00 $ 0.00
Basic and diluted net income applicable to Class A and Class B common stockholders $ 0.02 $ 0.00
Dividends paid per share $ 0.02  
Class A
    
Other income (expense):    
Net income from continuing operations 170 30
Shares used to calculate basic net income per share applicable to common stockholders    
Shares used to calculate basic net income per share applicable to common stockholders 7,741 9,570
Shares used to calculate diluted net income per share applicable to common stockholders    
Shares used to calculate diluted net income per share applicable to common stockholders 7,741 9,570
Class B
    
Other income (expense):    
Net income from continuing operations 676 86
Dividends paid to participating securities $ (36)  
Shares used to calculate basic net income per share applicable to common stockholders    
Shares used to calculate basic net income per share applicable to common stockholders 29,035 25,585
Shares used to calculate diluted net income per share applicable to common stockholders    
Shares used to calculate diluted net income per share applicable to common stockholders 39,761 35,550
[1] Excludes amortization of intangible assets from acquisitions
[2] Components of amortization of intangible assets from acquisitions: