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Balancing and Memorandum Account Recovery Procedures (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | $ 21,705 | $ 25,909
Regulatory Asset Increase (Decrease) |  | (2,031) | 4,335
Refunds (Collections) |  | 2 | (6,253)
Surcharge Offset |  | 0 | 76
Ending Balance |  | 19,676 | 24,067
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | 6,220 | 0
Regulatory Asset Increase (Decrease) |  | (321) | 0
Refunds (Collections) |  | 0 | 0
Surcharge Offset |  | 0 | 0
Ending Balance |  | 5,899 | 0
Balancing and Memorandum Account [Roll Forward] |  |  |
Beginning Balance |  | 27,925 | 25,909
Regulatory Asset Increase (Decrease) |  | (2,352) | 4,335
Refunds (Collections) |  | 2 | (6,253)
Surcharge Offset |  | 0 | 76
Ending Balance |  | 25,575 | 24,067
Regulatory Balancing and Memorandum Accounts, Net Under-Collected |  | 3,910 |
2014-2016 WCMA |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 190 | 1,589
Regulatory Asset Increase (Decrease) |  | 79 | 1,448
Refunds (Collections) |  | 1 | (1,232)
Surcharge Offset |  | 0 | (1,407)
Ending Balance |  | 270 | 398
2017 WCMA |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance | [1] | 6,489 | 0
Regulatory Asset Increase (Decrease) | [1] | 296 | 2,060
Refunds (Collections) | [1] | 0 | 0
Surcharge Offset | [1] | 0 | (2,060)
Ending Balance | [1] | 6,785 | 0
2018 WCMA |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | 0
Regulatory Asset Increase (Decrease) |  | (708) | 0
Refunds (Collections) |  | 0 | 0
Surcharge Offset |  | 0 | 0
Ending Balance |  | (708) | 0
Balancing and Memorandum Account [Roll Forward] |  |  |
Memorandum Account, Revenue Increase (Reduction) |  | (708) |
2012 General Rate Case true-up |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 11,319 | 20,682
Regulatory Asset Increase (Decrease) |  | 0 | 0
Refunds (Collections) |  | 1 | (2,258)
Surcharge Offset |  | 0 | 0
Ending Balance |  | 11,320 | 18,424
2015 General Rate Case true-up |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 115 | 5,528
Regulatory Asset Increase (Decrease) |  | 0 | 0
Refunds (Collections) |  | 0 | (1,431)
Surcharge Offset |  | 0 | 0
Ending Balance |  | 115 | 4,097
Cost of capital |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | (144) | (817)
Regulatory Asset Increase (Decrease) |  | (1,165) | 0
Refunds (Collections) |  | 0 | 358
Surcharge Offset |  | 0 | 0
Ending Balance |  | (1,309) | (459)
Tax memorandum |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | 0
Regulatory Asset Increase (Decrease) |  | (933) | 0
Refunds (Collections) |  | 0 | 0
Surcharge Offset |  | 0 | 0
Ending Balance |  | (933) | 0
Drought surcharges |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | (7,688)
Regulatory Asset Increase (Decrease) |  | 0 | 0
Refunds (Collections) |  | 0 | (833)
Surcharge Offset |  | 0 | 3,467
Ending Balance |  | 0 | (5,054)
Water supply costs |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | 5,190
Regulatory Asset Increase (Decrease) |  | 0 | 197
Refunds (Collections) |  | 0 | 297
Surcharge Offset |  | 0 | 0
Ending Balance |  | 0 | 5,684
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | 8,679 | 0
Regulatory Asset Increase (Decrease) |  | (482) | 0
Refunds (Collections) |  | 0 | 0
Surcharge Offset |  | 0 | 0
Ending Balance |  | 8,197 | 0
Pension |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 0 | (2,009)
Regulatory Asset Increase (Decrease) |  | 0 | 173
Refunds (Collections) |  | 0 | (703)
Surcharge Offset |  | 0 | 0
Ending Balance |  | 0 | (2,539)
Balancing and Memorandum Cost Recovery Account [Roll Forward] |  |  |
Beginning Balance |  | (2,459) | 0
Regulatory Asset Increase (Decrease) |  | 161 | 0
Refunds (Collections) |  | 0 | 0
Surcharge Offset |  | 0 | 0
Ending Balance |  | (2,298) | 0
All others |  |  |
Balancing and Memorandum Revenue Account [Roll Forward] |  |  |
Beginning Balance |  | 3,736 | 3,434
Regulatory Asset Increase (Decrease) |  | 400 | 457
Refunds (Collections) |  | 0 | (451)
Surcharge Offset |  | 0 | 76
Ending Balance |  | 4,136 | 3,516
2017 WCMA Reserve Recorded [Member] |  |  |
Balancing and Memorandum Account [Roll Forward] |  |  |
Memorandum Account, Revenue Increase (Reduction) |  | $ 1,022 | $ 0
[1] | As of March 31, 2018 and 2017, the reserve balance for the 2017 WCMA was $1,022 and $0, which has been netted from the balance above.

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