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Level 4 Retirement and Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 108 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Aug. 31, 2014
Aug. 31, 2023
Net periodic benefit cost [Abstract]              
Service cost $ 672,000 $ 1,206,000   $ 2,014,000 $ 3,557,000    
Interest cost 4,667,000 4,783,000   13,959,000 14,450,000    
Expected return on plan assets (5,025,000) (4,850,000)   (14,807,000) (14,541,000)    
Amortization of actuarial loss 2,333,000 1,824,000   6,870,000 5,808,000    
Amortization of prior service costs 23,000 41,000   68,000 124,000    
Net periodic benefit cost 2,670,000 3,004,000   8,104,000 9,398,000    
Pension contributions [Abstract]              
Fair Value of Pension Contribution of Real Property       4,000,000      
Rent payments for contributed properties           300,000  
Annual rent escalation rate for contributed properties             2.00%
Pension contributions       10,352,000 8,181,000    
Estimated remaining 2013 contributions     $ 400,000