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Restructuring Charges (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring Cost and Reserve        
Restructuring charges $ 0 $ 0 $ 2,206,000 $ 0
Restructuring cost incurred to date     9,500,000  
Restructuring Reserve [Roll Forward]        
Beginning Balance     906,000  
Restructuring charges 0 0 2,206,000 0
Payments     (2,059,000)  
Non-cash charge     (653,000)  
Ending Balance 400,000   400,000  
Employee Severance and Related Benefits
        
Restructuring Cost and Reserve        
Restructuring charges     246,000  
Restructuring Reserve [Roll Forward]        
Beginning Balance     906,000  
Restructuring charges     246,000  
Payments     (843,000)  
Non-cash charge     0  
Ending Balance 309,000   309,000  
Facilities
        
Restructuring Cost and Reserve        
Restructuring charges     1,960,000  
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Restructuring charges     1,960,000  
Payments     (1,216,000)  
Non-cash charge     (653,000) [1]  
Ending Balance 91,000   91,000  
Minimum
        
Restructuring Cost and Reserve        
Company estimate of the aggregate restructuring cost     6,000,000  
Maximum
        
Restructuring Cost and Reserve        
Company estimate of the aggregate restructuring cost     $ 10,000,000  
[1] The non-cash charge of $653 thousand is related to the termination of the Company's financing obligation associated with abandoning a construction asset at one of its facilities.