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Regulatory Assets and Liabilities | 6 Months Ended
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Jun. 30, 2019
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Regulatory assets and liabilities were comprised of the following as of June 30, 2019 and December 31, 2018:
| Recovery Period |  | June 30, 2019 |  | December 31, 2018
Regulatory Assets |  |  |  |  |  |  |
Pension and retiree group health | Indefinitely |  | $ | 156,618 |  |  | $ | 156,947 |
Property-related temporary differences (tax benefits flowed through to customers) | Indefinitely |  | 100,626 |  |  | 99,376 |
Other accrued benefits | Indefinitely |  | 21,342 |  |  | 20,588 |
Net WRAM and MCBA long-term accounts receivable | 1-2 years |  | 30,460 |  |  | 17,134 |
Asset retirement obligations, net | Indefinitely |  | 19,140 |  |  | 18,197 |
Interim rates long-term accounts receivable | 1 year |  | 4,642 |  |  | 4,642 |
Tank coating | 10 years |  | 12,559 |  |  | 11,196 |
Health care balancing account | 1 year |  | 442 |  |  | 442 |
Pension balancing account | 1 year |  | 18,211 |  |  | 16,494 |
Other components of net periodic benefit cost | Indefinitely |  | 3,983 |  |  | 3,221 |
Other regulatory assets | Various |  | 5,596 |  |  | 5,332 |
Total Regulatory Assets |  |  | $ | 373,619 |  |  | $ | 353,569 |
Regulatory Liabilities |  |  |  |  |  |  |
Future tax benefits due to customers |  |  | $ | 180,141 |  |  | $ | 180,205 |
Health care balancing account |  |  | 3,817 |  |  | 3,516 |
Conservation program |  |  | 6,599 |  |  | 6,880 |
Net WRAM and MCBA long-term payable |  |  | 120 |  |  | 222 |
Tax accounting memorandum account |  |  | 765 |  |  | 5,039 |
Cost of capital memorandum account |  |  | 147 |  |  | 2,834 |
1,2,3 trichloropropane settlement proceeds |  |  | 10,950 |  |  | 12,142 |
Other regulatory liabilities |  |  | 221 |  |  | 437 |
Total Regulatory Liabilities |  |  | $ | 202,760 |  |  | $ | 211,275 |
Short-term regulatory assets and liabilities are excluded from the above table. The short-term regulatory assets were $33.5 million as of June 30, 2019 and $42.4 million as of December 31, 2018. As of June 30, 2019 and December 31, 2018, the short-term regulatory assets primarily consist of net WRAM and MCBA receivables. The short-term portions of regulatory liabilities were $17.9 million as of June 30, 2019 and $12.2 million as of December 31, 2018. The short-term regulatory liabilities as of June 30, 2019, primarily consist of 1,2,3 trichloropropane (TCP) settlement proceeds, tax accounting memorandum account refunds, and cost of capital memorandum account refunds. As of December 31, 2018, the short-term regulatory liabilities primarily consist of TCP settlement proceeds and net WRAM and MCBA liability balances.

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