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Restructuring Charges (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 700,000 $ 6,600,000 $ 7,301,000 $ 0 $ 0
Restructuring Reserve [Roll Forward]          
Balance at December 31, 2011     0    
Restructuring charges 700,000 6,600,000 7,301,000 0 0
Payments for Restructuring     (6,395,000)    
Balance at December 31, 2012 906,000   906,000 0  
Employee Severance
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     7,301,000    
Restructuring Reserve [Roll Forward]          
Balance at December 31, 2011     0    
Restructuring charges     7,301,000    
Payments for Restructuring     (6,395,000)    
Balance at December 31, 2012 906,000   906,000    
Other Expense
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     0    
Restructuring Reserve [Roll Forward]          
Balance at December 31, 2011     0    
Restructuring charges     0    
Payments for Restructuring     0    
Balance at December 31, 2012 0   0    
CTO
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     3,400,000    
Restructuring Reserve [Roll Forward]          
Restructuring charges     3,400,000    
MID
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     700,000    
Restructuring Reserve [Roll Forward]          
Restructuring charges     700,000    
All Other
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     100,000    
Restructuring Reserve [Roll Forward]          
Restructuring charges     100,000    
Corporate Support Functions
          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     3,100,000    
Restructuring Reserve [Roll Forward]          
Restructuring charges     3,100,000    
Minimum
          
Restructuring Cost and Reserve [Line Items]          
Company estimate of the aggregate restructuring cost     6,000,000    
Maximum
          
Restructuring Cost and Reserve [Line Items]          
Company estimate of the aggregate restructuring cost     $ 8,000,000