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Retirement Plans (Components of Net Periodic Benefit Cost and Other Amount Recognized in Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]        
Curtailment expense     $ 0 $ 16
Retirement Income Plan [Member]
        
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]        
Service cost 1,627 1,857 4,880 6,163
Interest cost 3,253 3,053 9,760 9,407
Expected return on plan assets (3,919) (3,986) (11,756) (11,819)
Amortization of unrecognized prior service cost     0 10
Amortization of unrecognized net actuarial loss 367 772 1,102 3,366
Curtailment expense     0 16
Total net periodic cost 1,328 1,696 3,986 7,143
Retirement Life Plan [Member]
        
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]        
Service cost 0 0 0 0
Interest cost 73 69 219 208
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost     0 0
Amortization of unrecognized net actuarial loss 14 18 40 53
Curtailment expense     0 0
Total net periodic cost $ 87 $ 87 $ 259 $ 261