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Income Taxes - Additional Information (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 16, 2010
Dec. 31, 2008
Dec. 31, 2012
Dynamic Acquisition
Jun. 30, 2011
Arena Acquisition
Jul. 16, 2010
Arena Acquisition
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Income Taxes [Line Items]                    
Amount of partial valuation allowance released $ 100,288,000 $ 5,290,000 $ 447,500,000     $ 100,288,000 $ 7,000,000      
Alternative minimum tax credits, not subject to expiration 9,200,000                  
Federal net operating loss carryovers, subject to expiration 2,300,000,000                  
Federal net operating loss carryovers, beginning expiration year 2023                  
Federal net operating loss carryovers, ending expiration year 2032                  
Unrecognized excess tax benefits associated with the vesting of restricted stock awards 16,700,000                  
Federal net operating loss carryforwards to the IRC Section 382 limitation       627,800,000 298,400,000     119,900,000    
Unrecognized tax benefits 1,300,000 1,800,000                
Unrecognized tax benefits that would affect the effective tax rate if recognized 900,000                  
Unrecognized tax benefits, accrued gross interest 30,000 110,000 70,000              
Unrecognized tax benefits, accrued liability 210,000 180,000                
Beginning tax year, years open for federal examination 2009                  
Beginning tax year, years open due to federal net operating loss carryforwards 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 $ 1,000,000