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Pension Plans and Other Postretirement Benefits (Details Textual) - USD ($)
 2 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Dec. 31, 2006
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Minimum Years of Service Required       1 year    
Pension Expense   $ 8,527,000 $ 8,899,000 $ 11,850,000    
Health Reimbursement Account Balance   1,652,000       $ 7,310,000
Reduction in Expenses Due to Change in Plan       2,980,000    
Health Reimbursement Accounts Funding $ 252,000 $ 218,000 $ 523,000 $ 252,000    
Debt Securities [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Defined Benefit Plan, Target Allocation Percentage   50% fixed income funds        
Equity Securities [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Defined Benefit Plan, Target Allocation Percentage   50% equity        
Qualified Defined Contribution Plan [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Employer Contribution as Percentage of Eligible Compensation       5.00%    
Minimum Years of Service Required       3 years    
Employee Vesting Percentage       100.00%    
401 K Plan [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Employee Vesting Percentage   100.00%        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   3.00%        
Deferred Compensation Arrangement with Individual, Requisite Service Period   5 years        
Defined Benefit Plan [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Defined Benefit Plan Termination Benefits Terminated Participants Minimum Accrued Lump Sum Values 100,000          
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount 4,200,000     $ 4,200,000 $ 1,400  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 1,600,000          
Defined Benefit Plan, Future Amortization of Gain (Loss)   $ 389,000        
Supplemental Defined Benefit Plans [Member]            
Pension Plans and Other Postretirement Benefits Additional Textual [Abstract]            
Defined Benefit Plan, Future Amortization of Gain (Loss)   $ 258,000