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Retirement Benefits - Narrative (Details) - Defined Benefit Pension Plans - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net periodic pension expense for defined benefit pension plans        
Service cost $ 3,948 $ 4,537 $ 7,929 $ 9,208
Interest cost 4,924 5,714 9,899 11,581
Expected return on assets (8,193) (9,978) (16,472) (20,234)
Amortization of prior service credit (222) (236) (447) (479)
Recognized net actuarial loss 2,588 1,859 5,207 3,770
Loss on settlement 0 1,893 0 1,893
Net periodic pension expense 3,045 $ 3,789 6,116 $ 5,739
Company contributions     10,000  
Maximum        
Net periodic pension expense for defined benefit pension plans        
Expected contributions during 2018 $ 15,000   $ 15,000