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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 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 1,626 1,857 3,253 4,306
Interest cost 3,253 3,051 6,507 6,354
Expected return on plan assets (3,918) (3,985) (7,837) (7,833)
Amortization of unrecognized prior service cost     0 10
Amortization of unrecognized net actuarial loss 368 772 735 2,594
Curtailment expense     0 16
Total net periodic cost 1,329 1,695 2,658 5,447
Retirement Life Plan [Member]
        
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]        
Service cost 0 0 0 0
Interest cost 73 69 146 139
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost     0 0
Amortization of unrecognized net actuarial loss 13 17 26 35
Curtailment expense     0 0
Total net periodic cost $ 86 $ 86 $ 172 $ 174