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Pension and Postretirement Benefit Plans (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Recognized loss on distribution of plan's assets     $ 589,000
Expense for purchase of employee retirement annuities     141,000
Retired employees receiving health care and life insurance benefits 9    
Post retirement benefits, age eligibility requirement 65 years    
Post retirement benefits, service eligibility requirement 15 years    
Unrecognized net actuarial gain 44,000    
Recognized transition obligation 4,000    
Accumulated benefit obligation for the pension plan 0 0 0
Benefit obligation weighted average discount rate     6.10%
Expected long-term return on plan assets     5.00%
Annual rate of increase in cost of covered health care benefits, next fiscal year 10.00%    
Annual rate of increase in cost of covered health care benefits, two fiscal years 10.00%    
Annual rate of increase in cost of covered health care benefits, three fiscal years 8.00%    
Annual rate of increase in cost of covered health care benefits, four fiscal years 8.00%    
Annual rate of increase in cost of covered health care benefits, five fiscal years and thereafter 6.00%    
Postretirement Benefits Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost (3,000) (3,000) (5,000)
Unrecognized net actuarial gain 9,000 (2,000) (6,000)
Benefit obligation weighted average discount rate 2.75% 3.50% 4.25%
Effect of 1% rate increase on benefit obligation 5,000    
Effect of 1% rate increase on net periodic benefit cost (less than one thousand) 1,000    
Effect of 1% rate decrease on benefit obligation (4,000)    
Effect of 1% rate decrease on net periodic benefit cost (less than one thousand) $ 1,000