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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
Mar. 31, 2014
Mar. 31, 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 2,449
Interest cost 3,254 3,303
Expected return on plan assets (3,919) (3,848)
Amortization of unrecognized prior service cost 0 10
Amortization of unrecognized net actuarial loss 367 1,822
Curtailment expense 0 16
Total net periodic cost 1,329 3,752
Retirement Life Plan [Member]
    
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]    
Service cost 0 0
Interest cost 73 70
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net actuarial loss 13 18
Curtailment expense 0 0
Total net periodic cost $ 86 $ 88