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Retirement and Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net periodic benefit cost [Abstract]        
Net periodic benefit expense     $ 1,212 $ 2,881
Pension contributions [Abstract]        
Pension contributions     2,778 53,203
Estimated remaining 2016 contributions     1,000  
Pension Plan [Member]        
Net periodic benefit cost [Abstract]        
Service cost $ 282 $ 239 567 714
Interest cost 4,789 4,744 9,571 9,451
Expected return on plan assets (5,076) (5,495) (10,179) (10,695)
Amortization of actuarial loss 478 1,311 956 2,910
Plan settlement loss 0 0 297 501
Net periodic benefit expense $ 473 $ 799 $ 1,212 $ 2,881