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Commitments and Contingencies (Details)
 6 Months Ended
Jun. 30, 2015
USD ($)
a
Dec. 31, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]    
Asset Retirement Obligation $ 1,926,000 $ 1,807,000
Portion Of Site For Which Certificate Not Received | a 80  
Cost to complete remediation activities $ 332,000  
Restructuring Reserve [Roll Forward]    
Restructuring Reserve (2,367,000)  
Restructuring Charges (3,324,000)  
Payments for Restructuring 3,788,000  
Restructuring Reserve (1,903,000)  
Deferred Lease Revenue [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Charges 364,000  
Special Termination Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve (2,367,000)  
Restructuring Charges (1,574,000)  
Payments for Restructuring 2,038,000  
Restructuring Reserve (1,903,000)  
Facility Closing [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 0  
Restructuring Charges (1,750,000)  
Payments for Restructuring 1,750,000  
Restructuring Reserve $ 0