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Retirement and Benefit Plans (Details) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Aug. 10, 2018
Apr. 25, 2018
Sep. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Aug. 10, 2018
Apr. 25, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net periodic benefit cost [Abstract]                      
Net periodic benefit expense                 $ 25,000 $ 1,074  
Pension contributions [Abstract]                      
Pension contributions       $ 20,000         $ 21,566 1,666  
Pension Plan [Member]                      
Defined Benefit Plan Disclosure [Line Items]                      
Increase(Decrease) of Assets Transferred to (from) Plan $ (124,800) $ (151,800)                  
Percentage of Defined Benefit Plan Assets Transferred Out of Plan                 60.00%    
Actuarial Gain (Loss)       (3,900) $ 13,300            
Discount Rate 3.95% 4.05%         3.95% 4.05%     3.40%
Expected Long-term Rate of Return on Plan Assets     3.85%       4.50% 4.75%      
Net periodic benefit cost [Abstract]                      
Service cost       196   $ 301     $ 598 903  
Interest cost       2,278   4,392     9,602 13,150  
Expected return on plan assets       (1,903)   (4,743)     (9,783) (14,224)  
Amortization of actuarial loss       151   441     1,328 1,245  
Plan settlement loss       11,252 $ 12,000 0     23,255 0  
Net periodic benefit expense       11,974   $ 391     25,000 $ 1,074  
Pension contributions [Abstract]                      
Estimated remaining 2018 pension contributions     $ 4,500 4,500         4,500    
Pension Plan, Repurchases [Member]                      
Pension contributions [Abstract]                      
Estimated remaining 2018 pension contributions     $ 4,000 $ 4,000         $ 4,000