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Income Taxes - Additional Information (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 16, 2010
Dec. 31, 2008
Dec. 31, 2012
Dynamic Acquisition
Jun. 30, 2011
Arena Acquisition
Jul. 16, 2010
Arena Acquisition
Dec. 31, 2013
Beginning Year
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Dec. 31, 2013
Ending Year
Dec. 31, 2013
Beginning tax year
Dec. 31, 2013
Beginning tax year as result of federal NOL carryforwards
Income Taxes [Line Items]                            
Reversal of deferred tax asset valuation allowance $ (3,842,000) $ 100,288,000 $ 6,986,000     $ 100,288,000 $ 6,986,000              
Alternative minimum tax credits, not subject to expiration 13,100,000                          
Federal net operating loss carryovers, subject to expiration 2,600,000,000     629,800,000 298,400,000     119,900,000            
Operating loss carryforwards expiration year                 2023     2033    
Unrecognized excess tax benefits from stock based compensation 16,300,000                          
Unrecognized tax benefits 1,382,000 1,330,000 1,758,000                      
Unrecognized tax benefits that would affect the effective tax rate if recognized 900,000                          
Unrecognized tax benefits, accrued gross interest (100,000) 30,000 100,000                      
Unrecognized tax benefits, accrued liability 100,000 200,000                        
Open tax year                         2010 2003
Number of tax years open for state tax audit (in years)                   3 years 5 years      
Decrease in gross unrecognized tax benefits balance within next twelve months $ 800,000