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Retirement and Benefit Plans (Details)
$ in Thousands
 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended
May. 15, 2015
USD ($)
Mar. 09, 2015
USD ($)
May. 15, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
May. 14, 2015
USD ($)
Jun. 30, 2015
USD ($)
Integer5
Jun. 30, 2014
USD ($)
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]                    
Defined Benefit Plan, Funded Status, Period Improvement           $ 69,300        
Defined Benefit Plan, Actuarial Gain (Loss)           19,300        
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)           $ 50,000        
Discount rate 3.90%   3.90%             3.75%
Expected return on plan assets           6.15%        
Net periodic benefit cost [Abstract]                    
Net periodic benefit cost             $ 2,881 $ 357    
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             2,000      
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       $ 53,203 780    
Estimated remaining 2015 contributions             1,000      
Pension Plan [Member]                    
Net periodic benefit cost [Abstract]                    
Service cost       $ 239 $ 414   714 815    
Interest cost       4,744 4,929   9,451 10,080    
Expected return on plan assets       (5,495) (5,258)   (10,695) (10,526)    
Amortization of actuarial (gain) loss       1,311 (6)   2,910 (12)    
Plan settlement loss       0 0   501 0    
Net periodic benefit cost       $ 799 $ 79   $ 2,881 $ 357    
Scenario, Forecast [Member]                    
Defined Benefit Plan Disclosure [Line Items]                    
Expected return on plan assets                 5.85%