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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Interest Rate Swap [Abstract]    
Term of debt on utilities rated A- used to discount prospective cash flows 30 years  
Reduction in fair value of swap liability $ 132  
Fair Value on a Recurring Basis [Member]    
Interest Rate Swap [Abstract]    
Interest rate swap 2,221 $ 2,292
Fair Value on a Recurring Basis [Member] | Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]    
Interest Rate Swap [Abstract]    
Interest rate swap 2,221 2,292
Carrying Amount [Member]    
Fair Value, Financial Liabilities [Abstract]    
Total long-term debt 87,477 87,488
Estimate of Fair Value [Member]    
Fair Value, Financial Liabilities [Abstract]    
Total long-term debt 98,000 99,000
Carrying Amount (Fair Value Not Accurately Estimated) [Member]    
Liabilities [Abstract]    
Customer advances for construction 7,143 7,102
Assets [Abstract]    
Notes receivable $ 255 $ 255