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Income Tax Other information (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax (Textual) [Abstract]        
Income taxes paid   $ 200,000 $ 2,600,000 $ 5,300,000
Income tax refunds received   3,400,000 3,300,000 5,800,000
Increase in deferred tax asset valuation allowance 33,500,000 33,300,000    
Operating Loss Carryforwards [Line Items]        
Net operating loss and tax credit carryforwards   65,600,000    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at beginning of year   92,000 0  
Additions for tax positions of current year   1,261,000 92,000  
Additions for tax positions of prior years   835,000 0  
Reductions for tax positions of prior years   (92,000) 0  
Settlements   0 0  
Balance at end of year   2,096,000 92,000 0
State
        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards   33,400,000    
Foreign
        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforwards   500,000    
US Federal
        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards   $ 31,700,000