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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Stock-based compensation $ 21,605 $ 17,596
Net operating loss carryforwards 15,005 9,415
Provision for accrued expenses 6,824 5,950
Other 4,298 4,597
Total deferred tax assets 47,732 37,558
Less valuation allowance (11,677) (9,239)
Net deferred tax assets 36,055 28,319
Deferred tax liabilities:    
Intangible assets (28,205) (26,699)
Property and equipment (10,313) (10,059)
Prepaid expenses (2,087) (923)
Other   (148)
Total deferred tax liabilities (40,605) (37,829)
Net deferred tax liability $ (4,550) $ (9,510)