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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Retirement Income Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1,963 $ 1,626 $ 3,927 $ 3,253
Interest cost 3,501 3,253 7,003 6,507
Expected return on plan assets (3,990) (3,918) (7,981) (7,837)
Amortization of unrecognized net actuarial loss 1,695 368 3,390 735
Total net periodic cost 3,169 1,329 6,339 2,658
Retirement Life Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 0 0 0
Interest cost 63 73 126 146
Expected return on plan assets 0 0 0 0
Amortization of unrecognized net actuarial loss 14 13 28 26
Total net periodic cost $ 77 $ 86 $ 154 $ 172