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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 1,606 $ 1,913
Interest cost 3,102 3,408
Expected return on plan assets (3,988) (3,990)
Amortization of unrecognized net actuarial loss 1,480 1,643
Total net periodic cost $ 2,200 $ 2,974