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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Chesapeake Pension Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest Cost $ 125 $ 130 $ 250 $ 260
Expected return on plan assets (109) (101) (218) (202)
Amortization of prior service cost (2) (2) (3) (3)
Amortization of net loss 85 39 170 78
Net periodic cost (benefit) 99 66 199 133
Settlement expense       217
Total periodic cost 99 66 199 350
FPU Pension Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest Cost 639 672 1,278 1,343
Expected return on plan assets (657) (684) (1,315) (1,368)
Amortization of net loss 44   88  
Net periodic cost (benefit) 26 (12) 51 (25)
Amortization of pre-merger regulatory asset 191 191 381 381
Total periodic cost 217 179 432 356
Chesapeake Pension SERP [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest Cost 22 27 45 54
Amortization of prior service cost 5 5 10 10
Amortization of net loss 12 9 23 19
Net periodic cost (benefit) 39 41 78 83
Total periodic cost 39 41 78 83
Chesapeake Postretirement Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest Cost 15 15 30 30
Amortization of prior service cost (20)   (40)  
Amortization of net loss 17   35  
Net periodic cost (benefit) 12 15 25 30
Total periodic cost 12 15 25 30
FPU Medical Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost 40 27 80 53
Interest Cost 45 39 90 78
Amortization of net loss 22 5 45 10
Net periodic cost (benefit) 107 71 215 141
Amortization of pre-merger regulatory asset 2 2 4 4
Total periodic cost $ 109 $ 73 $ 219 $ 145