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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations [Abstract]            
Tax provision $ 7,623,000 $ 1,529,000 $ 11,009,000 $ 2,535,000    
Deferred Tax Assets, Net of Valuation Allowance [Abstract]            
Deferred tax assets, operating loss carryforwards         183,000,000 185,000,000
Deferred tax assets, valuation allowance         $ 64,100,000 $ 185,000,000
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]            
Effective Income Tax Rate, Continuing Operations     40.70%