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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0 $ 1,912 $ 1,606 $ 3,825
Interest cost 3,101 3,407 6,203 6,816
Expected return on plan assets (3,988) (3,990) (7,976) (7,981)
Amortization of unrecognized net actuarial loss 1,481 1,644 2,961 3,287
Total net periodic cost $ 594 $ 2,973 $ 2,794 $ 5,947