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Retirement and Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension contributions [Abstract]          
Pension contributions       $ 3,338 $ 53,701
Estimated remaining 2016 contributions       500  
Pension Plan [Member]          
Net periodic benefit cost [Abstract]          
Service cost   $ 279 $ 12 846 726
Interest cost   4,805 4,808 14,376 14,259
Expected return on plan assets   (5,131) (5,844) (15,310) (16,539)
Amortization of actuarial loss   584 987 1,540 3,897
Plan settlement loss   0 0 297 501
Net periodic benefit expense   $ 537 $ (37) $ 1,749 $ 2,844
Pension Plan [Member] | Subsequent Event [Member]          
Pension contributions [Abstract]          
Pension Plan, Lump-sum cash settlement $ 21,000