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Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in allowance for doubtful accounts            
Balance at beginning of year $ 892 $ 1,187 $ 1,228      
Provision charged to expense 869 991 1,145      
Accounts written off, net of recoveries 817 1,286 1,186      
Balance at end of year 944 892 1,187      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       $ 790 $ 803 $ 755
Allowance for doubtful accounts related to other accounts receivable       154 89 432
Total allowance for doubtful accounts 892 1,187 1,228 944 892 1,187
GSWC            
Changes in allowance for doubtful accounts            
Balance at beginning of year 892 1,114 1,177      
Provision charged to expense 844 1,055 1,056      
Accounts written off, net of recoveries 817 1,277 1,119      
Balance at end of year 919 892 1,114      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       790 803 755
Allowance for doubtful accounts related to other accounts receivable       129 89 359
Total allowance for doubtful accounts $ 892 $ 1,114 $ 1,177 $ 919 $ 892 $ 1,114