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Regulatory Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Regulatory Assets [Line Items]    
Regulatory assets: $ 129,111 $ 88,218
Regulatory liabilities: 2,266 4,675
Net Regulatory Assets 126,845 83,543
Less: current regulatory asset, net 17,308 0
Total regulatory assets, net, less current portion 109,537 83,543
Cost of capital memorandum account
    
Regulatory Assets [Line Items]    
Regulatory liabilities: 2,266 2,297
Water supply balancing accounts
    
Regulatory Assets [Line Items]    
Regulatory liabilities: 0 2,378
Income tax temporary differences, net
    
Regulatory Assets [Line Items]    
Regulatory assets: 8,220 8,220
Postretirement pensions and other medical benefits
    
Regulatory Assets [Line Items]    
Regulatory assets: 62,949 62,949
2012 General Rate Case true-up
    
Regulatory Assets [Line Items]    
Regulatory assets: 46,456 0
Pension balancing account
    
Regulatory Assets [Line Items]    
Regulatory assets: 2,924 9,734
Water rate assistance program balancing account
    
Regulatory Assets [Line Items]    
Regulatory assets: 2,189 2,590
Water supply balancing accounts
    
Regulatory Assets [Line Items]    
Regulatory assets: 1,239 0
Other
    
Regulatory Assets [Line Items]    
Regulatory assets: $ 5,134 $ 4,725