Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax (Additional Textual) [Abstract]        
Change in valuation allowance related to deferred tax assets $ 4,500,000   $ 51,000,000  
Income Taxes (Textual) [Abstract]        
Gross deferred tax assets related to state net operating loss carryforwards 294,300,000      
Valuation allowance related to certain state net operating loss carryforward deferred tax assets 6,300,000      
Liabilities recorded related to unrecognized tax benefits   18,600,000    
Liabilities related to interest and penalties 2,400,000 4,900,000    
Unorganized tax benefit would affect income tax rate if recognized 5,500,000 11,600,000    
Income tax examination range Upper limit 2006      
Income tax examination range lower limit 2012      
Accrued interest and penalties 2,400,000 4,900,000 5,100,000 6,400,000
Net short-term deferred tax asset 16,500,000 2,300,000    
Net long-term deferred tax asset 4,300,000 17,600,000    
Net long-term deferred tax liability 10,768,000 1,419,000    
State and Local Jurisdiction [Member]
        
Income Tax (Additional Textual) [Abstract]        
Operating loss expiration date net operating loss carryforwards that will expire between 2015 and 2032      
Continuing Operations [Member]
        
Income Tax (Additional Textual) [Abstract]        
Change in valuation allowance related to deferred tax assets     48,800,000  
Discontinued Operations [Member]
        
Income Tax (Additional Textual) [Abstract]        
Change in valuation allowance related to deferred tax assets     $ 2,200,000