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Rates and Other Regulatory Activities (Details) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jan. 30, 2012
Florida [Member]
Jan. 31, 2011
Florida [Member]
Nov. 30, 2009
Florida [Member]
Jul. 31, 2009
Florida [Member]
Jun. 30, 2015
Florida [Member]
Jun. 30, 2014
Florida [Member]
Jun. 30, 2013
Florida [Member]
Jun. 30, 2012
Florida [Member]
Customer
mi
Dec. 31, 2011
Florida [Member]
Dec. 31, 2010
Eastern Shore [Member]
Jun. 30, 2012
Eastern Shore [Member]
Dekatherms
Dec. 31, 2011
Eastern Shore [Member]
Dec. 30, 2010
Eastern Shore [Member]
Jun. 30, 2012
Eastern Shore [Member]
Mainline Expansion Project [Member]
Dekatherms
May 14, 2012
Eastern Shore [Member]
Mainline Expansion Project [Member]
Rates and Other Regulatory Activities (Textual) [Abstract]                              
Inclusion of acquisition adjustment $ 34,200,000                            
Costs related to mergers 2,200,000                            
Amortization period of merger cost 30 years   5 years                        
Regulatory asset which represents portion of the goodwill allowed to be recovered in future rates after the effective date of the Florida PSC order                 31,700,000            
Regulatory asset related to the gross-up of the acquisition adjustment for income tax               349,000 18,100,000            
Portion of the merger-related costs allowed to be recovered in future rates after the effective date                 1,300,000            
Amortization expense in depreciation and amortization in the accompanying of income condensed consolidated statement               1,200,000              
Amortization expense related to assets               2,400,000              
Amortization of acquired intangible assets year one               2,400,000              
Amortization of acquired intangible assets year two               2,300,000              
Amortization of acquired intangible assets year three               1,800,000              
Net of Tax               1,400,000              
Net of tax year one             1,400,000                
Net of tax year two           1,400,000                  
Net of tax year three         1,100,000                    
Joint construction, ownership and operation of a pipeline extension               16              
Estimated project cost of pipeline               5,700,000              
Duration of right to give notice to FPU               180 days              
Duration of closing of the purchase               12 months              
Loss of earnings generated by FPU from number of customer               3,000              
Reduction in depreciation due to change in depreciation rates               227,000              
Period of replace qualifying mains and services               10 years              
Annual cost of service                   29,100,000          
Pre-tax return                         13.90%    
Number of dekatherms per day                     15,000        
Regulatory liability related to the refund due to customers as a result of the settlement                       1,300,000      
Expected percentage owned pipeline under the agreement               45.00%              
Period of franchise not to exceed to operation       10 years                      
Period of current agreement exceeds   2 years                          
Petition expiration date               Dec. 31, 2019              
Regulatory liabilities contingency gain               1,900,000              
Tax contingency gain on regulatory liabilities               1,200,000              
Regulatory liabilities gross up tax               748,000              
Regulatory liability amortization period               amortize it over a period from January 2012 to October 2014              
Approval for volume of additional firm service to construct own and operate the facilities                           15,040  
Estimated capital cost of Mainline Expansion Project                             16,300,000
Filing period for fuel retention percentage and cash out surcharge                     24 months        
Amount of refund to eligible customers                     $ 319,933