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Components of Net Periodic Benefit Cost (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
acre
Nov. 30, 2012
acre
Apr. 30, 2011
acre
Jun. 30, 2013
acre
Jun. 30, 2012
Jun. 30, 2013
acre
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Net periodic benefit costs for pension benefits                  
Interest cost       $ 720,000 $ 798,000 $ 1,440,000 $ 1,596,000    
Expected return on plan assets       (726,000) (717,000) (1,452,000) (1,434,000)    
Recognized actuarial loss       228,000 185,000 456,000 370,000    
Net expense       222,000 266,000 444,000 532,000    
Security to support the unfunded liabilities of the Bargaining Unit and Hourly Employees (Bargaining Plan                 5,200,000
Area of property pledged as security (in acres)   7,000 1,400            
Period for release of property pledged as collateral   5 years 5 years            
Additional security to support unfunded liabilities               18,700,000  
Area of parcel proposed to be sold (in acres) 270                
Unfunded pension fund liabilities 29,284,000     29,284,000   29,284,000   30,394,000  
Area of property held as collateral for unfunded pension obligations (in acres) 7,000     7,000   7,000      
Expected minimum required contributions 2,100,000     2,100,000   2,100,000      
Contributions funded by employer           $ 900,000