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Balancing and Memorandum Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | $ 25,549 | $ 21,705
Regulatory Asset Increase (Decrease) |  | 611 | (2,031)
Refunds (Collections) Adjustments |  | (2,679) | 2
Ending Balance |  | 23,481 | 19,676
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | 8,864 | 6,220
Regulatory Asset Increase (Decrease) |  | (558) | (321)
Refunds (Collections) Adjustments |  | (311) | 0
Ending Balance |  | 7,995 | 5,899
Balancing and Memorandum Account [Roll Forward] |  |  |
Beginning Balance |  | 34,413 | 27,925
Regulatory Asset Increase (Decrease) |  | 53 | (2,352)
Refunds (Collections) |  | (2,990) | 2
Ending Balance |  | 31,476 | 25,575
Total balance, net under-collection amount |  | $ 1,276 |
Authorized revenue, threshold percentage |  | 2.00% |
2014-2017 WCMA |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance | [1] | $ 7,750 | 6,679
Regulatory Asset Increase (Decrease) | [1] | 0 | 375
Refunds (Collections) Adjustments | [1] | (838) | 1
Ending Balance | [1] | 6,912 | 7,055
2018 WCMA |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory liability, due to sales in excess of authorized usage |  | (309) | (708)
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance | [1] | 9,386 | 0
Regulatory Asset Increase (Decrease) | [1] | (389) | (708)
Refunds (Collections) Adjustments | [1] | 0 | 0
Ending Balance | [1] | 8,997 | (708)
2019 WCMA |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory liability, due to sales in excess of authorized usage |  | 752 |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | 0
Regulatory Asset Increase (Decrease) |  | (752) | 0
Refunds (Collections) Adjustments |  | 0 | 0
Ending Balance |  | (752) | 0
2012 General Rate Case true-up |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 11,328 | 11,319
Regulatory Asset Increase (Decrease) |  | 95 | 0
Refunds (Collections) Adjustments |  | (1,271) | 1
Ending Balance |  | 10,152 | 11,320
Cost of capital memorandum account |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | (1,523) | (144)
Regulatory Asset Increase (Decrease) |  | (9) | (1,165)
Refunds (Collections) Adjustments |  | 0 | 0
Ending Balance |  | (1,532) | (1,309)
Tax memorandum account |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | (6,504) | 0
Regulatory Asset Increase (Decrease) |  | (41) | (933)
Refunds (Collections) Adjustments |  | 0 | 0
Ending Balance |  | (6,545) | (933)
All others |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 5,112 | 3,851
Regulatory Asset Increase (Decrease) |  | 1,707 | 400
Refunds (Collections) Adjustments |  | (570) | 0
Ending Balance |  | 6,249 | 4,251
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | 1,090 | 0
Regulatory Asset Increase (Decrease) |  | 3 | 0
Refunds (Collections) Adjustments |  | (78) | 0
Ending Balance |  | 1,015 | 0
Water supply costs |  |  |
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | 9,617 | 8,679
Regulatory Asset Increase (Decrease) |  | (745) | (482)
Refunds (Collections) Adjustments |  | (655) | 0
Ending Balance |  | 8,217 | 8,197
Pension |  |  |
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | (1,843) | (2,459)
Regulatory Asset Increase (Decrease) |  | 184 | 161
Refunds (Collections) Adjustments |  | 422 | 0
Ending Balance |  | (1,237) | (2,298)
2018 WCMA Reserve Recorded |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Reserve recorded |  | $ (80) |
2017 WCMA Reserve Recorded |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Reserve recorded |  |  | $ (1,022)
[1] | As of March 31, 2019, the reserve balances for the 2018 WCMA was $80 which has been included in the balances above. As of March 31, 2018, the reserve balance for the 2017 WCMA was $1,022 which has been included in the balance above.

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