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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Allocation of Plan Assets

The following tables summarize the fair values of the Rabbi Trust investment assets to fund CTWS’s SERP by major categories as of December 31, 2020 and 2019 :

												Fair Value Measurements at December 31, 2020
Asset Category						Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Money market funds						$	83					83						—						—
Mutual funds						2,101						2,101						—						—
Fixed income						830						830						—						—
Total						$	3,014					3,014						—						—

												Fair Value Measurements at December 31, 2019
Asset Category						Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Money market funds						$	20					20						—						—
Mutual funds						834						834						—						—
Fixed income						2,329						2,329						—						—
Total						$	3,183					3,183						—						—

Plan assets as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2020						2019						2020						2019
Fair value of assets at end of year:
Debt securities			$	95,935					86,288						$	5,684					5,608
			35		%				36		%				29		%				33		%
Equity securities			170,747						146,210						12,762						10,840
			61		%				60		%				66		%				63		%
Cash and equivalents			11,442						11,023						1,033						778
			4		%				5		%				5		%				5		%
Total			$	278,124					243,521						$	19,479					17,226

The following tables summarize the fair values of plan assets by major categories as of December 31, 2020 and 2019:

									Fair Value Measurements at December 31, 2020
Asset Category			Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Cash and cash equivalents			$	12,475					12,475						—						—
Equity securities (a)			183,509						183,509						—						—
Fixed Income (b)			101,619						36,012						65,607						—
Total			$	297,603					231,996						65,607						—

___________________________________

(a)Actively managed portfolio of equity securities with the goal to exceed the benchmark performance.

(b)Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance

									Fair Value Measurements at December 31, 2019
Asset Category			Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Cash and cash equivalents			$	11,801					11,801						—						—
Equity securities (a)			157,050						149,265						7,785						—
Fixed Income (b)			91,896						31,686						60,210						—
Total			$	260,747					192,752						67,995						—

___________________________________

(a)Actively managed portfolio of equity securities with the goal to exceed the benchmark performance.

(b)Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance

Schedule of Assumptions Used

Net periodic cost for the defined benefit plans and other postretirement benefits was calculated using the following weighted-average assumptions:

			Pension Benefits																		Other Benefits
			2020						2019						2018						2020						2019						2018
			%						%						%						%						%						%
Discount rate			3.05 - 3.23						3.04 - 4.16						3.52						2.59 - 3.18						2.52 - 4.09						3.45
Expected return on plan assets			6.50, 6.75						7.00, 7.25						7.00						4.20, 6.50						4.00, 7.00						7.00
Rate of compensation increase			4.00						4.00						4.00						N/A						N/A						N/A

Benefit obligations for the defined benefit plans and other postretirement benefits were calculated using the following weighted-average assumptions as of December 31:

			Pension Benefits												Other Benefits
			2020						2019						2020						2019
			%						%						%						%
Discount rate			2.29 - 2.48						3.05 - 3.23						2.18 - 2.41						2.59 - 3.18
Rate of compensation increase			4.00						4.00						N/A						N/A

Schedule of Net Benefit Costs

Net periodic costs for the defined benefit plans and other postretirement benefits for the years ended December 31 was as follows:

			Pension Benefits																		Other Benefits
			2020						2019						2018						2020						2019						2018
Components of net periodic benefit cost
Service cost			$	8,659					5,947						5,790						$	900					581						616
Interest cost			10,484						8,506						6,879						956						775						627
Expected return on assets			(15,715)						(10,118)						(9,255)						(857)						(475)						(450)
Amortization of prior service cost			41						48						51						97						197						197
Recognized actuarial loss			4,971						3,984						3,986						229						240						321
Net periodic benefit cost			$	8,440					8,367						7,451						$	1,325					1,318						1,311

Schedule of Net Funded Status

The projected benefit obligations and the funded status of the defined benefit pension and other postretirement plans as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2020						2019						2020						2019
Change in benefit obligation
Benefit obligation at beginning of year			$	338,240					187,877						$	32,546					17,489
Service cost			8,659						5,947						900						581
Interest cost			10,484						8,506						956						775
Business combination			—						108,162						—						12,537
Actuarial (gain)/loss			42,164						35,502						2,421						2,027
Implicit rate subsidy			—						—						(211)						(217)
Plan participants contributions			—						—						254						85
Administrative expenses paid			(163)						(10)						—						—
Benefits paid			(13,293)						(7,744)						(1,072)						(731)
Benefit obligation at end of year			$	386,091					338,240						$	35,794					32,546
Change in plan assets
Fair value of assets at beginning of year			$	243,521					127,610						$	17,226					5,849
Actual return on plan assets			32,869						34,807						2,383						1,972
Business combination			—						79,382						—						9,314
Employer contributions			16,609						9,476						675						738
Plan participants contributions			—						—						254						85
Administrative expenses paid			(163)						(10)						(54)						(55)
Benefits paid			(14,712)						(7,744)						(1,005)						(677)
Fair value of plan assets at end of year			278,124						243,521						19,479						17,226
Funded status at end of year			$	(107,967)					(94,719)						$	(16,315)					(15,320)

Schedule of Amounts Recognized in Balance Sheet

The amounts recognized on the balance sheet as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2020						2019						2020						2019
Current liabilities			$	2,760					1,899						$	133					96
Noncurrent liabilities			105,207						92,820						16,182						15,224
			$	107,967					94,719						$	16,315					15,320

Schedule of Regulatory Asset Recorded on the Projected Benefit Obligation of the Postretirement Benefit Plans

SJW Group recorded a regulatory asset on the projected benefit obligation of the postretirement benefit plans as follows:

			2020						2019
Funded status of obligation			$	124,282					110,039
Accrued benefit cost			(28,723)						(36,514)
Regulatory asset, amount to be recovered in future rates			$	95,559					73,525

Schedule of Expected Benefit Payments

Benefits expected to be paid in the next five years and in the aggregate for the five years thereafter are:

			Pension Plan						Other Postretirement Benefit Plan
2021			$	15,707					$	1,441
2022			15,097						1,511
2023			15,979						1,596
2024			16,023						1,676
2025			16,541						1,671
2026 - 2030			91,120						8,857

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