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Retirement and Benefit Plans (Details)
$ in Thousands
 2 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended 9 Months Ended
May. 15, 2015
USD ($)
Mar. 09, 2015
USD ($)
May. 15, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
May. 14, 2015
USD ($)
Dec. 31, 2015
Sep. 30, 2015
USD ($)
Integer5
Sep. 30, 2014
USD ($)
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]                    
Defined Benefit Plan, Funded Status, Period Improvement           $ 69,300        
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)           50,000        
Defined Benefit Plan, Actuarial Gain (Loss)           $ 19,300        
Discount rate 3.90%   3.90%             3.75%
Expected return on plan assets           6.15%        
Net periodic benefit cost [Abstract]                    
Net periodic benefit (income) expense               $ 2,844 $ 597  
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]                    
Amount of actuarial loss that will be amortized from accumulated other comprehensive loss for reminder of 2015               1,000    
Pension contributions [Abstract]                    
Fair Value of Pension Contribution of Real Property               $ 3,000    
Contributed Properties Leaseback Transaction Lease Term               10 years    
Number of Extension Options for Contributed Properties | Integer5               2    
Extension Terms of Contributed Properties               5 years    
Rent payments for contributed properties               $ 200    
Annual rent escalation rate for contributed properties               2.00%    
Pension contributions $ 40,000 $ 10,000 $ 50,000         $ 53,701 11,675  
Estimated remaining 2015 contributions               500    
Pension Plan [Member]                    
Net periodic benefit cost [Abstract]                    
Service cost       $ 12 $ 433     726 1,248  
Interest cost       4,808 5,050     14,259 15,130  
Expected return on plan assets       (5,844) (5,238)     (16,539) (15,764)  
Amortization of actuarial (gain) loss       987 (5)     3,897 (17)  
Plan settlement loss       0 0     501 0  
Net periodic benefit (income) expense       $ (37) $ 240     $ 2,844 $ 597  
Scenario, Forecast [Member]                    
Defined Benefit Plan Disclosure [Line Items]                    
Expected return on plan assets             5.85%