Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:    
Accounts receivable allowances $ 800 $ 965
Unearned revenue 873 559
Accrued liabilities not yet deductible 3,420 981
Federal and State net operating loss ("NOL") carryforwards 46,574 42,002
Tax credit carryforwards 167 167
Stock-based compensation 1,971 1,001
Other 1,109 145
Total deferred tax assets 54,914 45,820
Less valuation allowance (667) (667)
Deferred tax assets after valuation allowance 54,247 45,153
Deferred tax liabilities:    
Purchased intangibles (41,287) (21,916)
Property and equipment (11,588) (8,508)
Other (1,625)  
Total deferred tax liabilities (54,500) (30,424)
Net deferred tax assets (253) 14,729
Deferred tax assets:    
Current 4,796 1,955
Noncurrent 2,595 12,774
Deferred tax liabilities:    
Noncurrent (7,644)  
Net deferred tax assets $ (253) $ 14,729