EMPLOYEE BENEFIT PLANS (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assumed health care cost trend rate
Annual rate of increase in the per capita cost (as a percent)	7.80%
Decreased annual rate by 2018 (as a percent)	5.70%
Ultimate health care cost trend rate (as a percent)	4.50%
Period in which ultimate health care cost trend rate is expected to be reached	50 years
Assumed health care cost trend rates affect the amounts reported for the postretirement benefit plans
Effect on total service and interest cost, increase	$ 2,633
Effect on total service and interest cost, decrease	(1,950)
Effect on accumulated postretirement benefit obligations, increase	37,120
Effect on accumulated postretirement benefit obligations, decrease	(27,219)
Minimum
Amounts recognized in the consolidated balance sheets:
Percentage of expected results within which long-term rate of return falls	25.00%
Maximum
Amounts recognized in the consolidated balance sheets:
Percentage of expected results within which long-term rate of return falls	75.00%
Fixed Income
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Long-term rate of return on assets (as a percent)	4.98%
Amounts recognized in the consolidated balance sheets:
Assumed percentage of portfolio investment	40.00%
Assumed long-term inflation rate (as a percent)	2.50%
Fixed Income \| Minimum
Target asset allocation percentages for major categories of the pension plan
Maturity period	1 year
Fixed Income \| Maximum
Target asset allocation percentages for major categories of the pension plan
Maturity period	5 years
Equity Securities
Amounts recognized in the consolidated balance sheets:
Assumed percentage of portfolio investment	60.00%
Assumed long-term inflation rate (as a percent)	2.50%
Total Domestic Equity
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Long-term rate of return on assets (as a percent)	8.26%
Non-U.S. Equities
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Long-term rate of return on assets (as a percent)	8.83%
Short-term cash investments
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Long-term rate of return on assets (as a percent)	3.16%
Pension plans
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	306,344	266,178	202,947
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Discount rate (as a percent)	4.00%	5.00%
Long-term rate of return on assets (as a percent)	6.50%	6.75%
Rate of compensation increase (as a percent)	3.25%	4.00%
Cost of living adjustment (as a percent)	2.50%	3.00%
Change in projected benefit obligation:
Balance at the beginning of the period	383,198	402,121
Service cost	15,964	17,780	15,450
Interest cost	18,920	16,354	15,287
Assumption change	89,692	(53,887)
Experience loss	2,158	6,021
Benefits paid, net of retiree premiums	(7,347)	(5,191)
Balance at the end of the period	502,585	383,198	402,121
Change in plan assets:
Fair value of plan assets at beginning of year	266,178	202,947
Actual return on plan assets	19,374	36,637
Employer contributions	28,139	31,785
Benefits paid	(7,347)	(5,191)
Fair value of plan assets at end of year	306,344	266,178	202,947
Reconciliation of funded status
Funded status	(196,241)	(117,020)
Unrecognized actuarial loss	138,609	53,882
Unrecognized prior service cost	30,390	36,116
Net amount recognized in the balance sheet	(27,242)	(27,022)
Short-term portion of the pension benefits	1,786	1,751
Amounts recognized in the consolidated balance sheets:
Accrued benefit liability	(196,241)	(117,020)
Regulatory asset	168,999	89,998
Net amount recognized in the balance sheet	(27,242)	(27,022)
Average return for last five years (as a percent)	9.70%
Components of the pension plans and other postretirement benefits
Service cost	15,964	17,780	15,450
Interest cost	18,920	16,354	15,287
Expected return on plan assets	(16,599)	(14,252)	(11,558)
Net amortization and deferral	10,074	15,302	14,283
Net periodic benefit cost	28,359	35,184	33,462
Sensitivity of pension amounts to changes in actuarial assumptions
Effect of 0.5 percentage-point decrease in the discount rate on the net periodic pension benefit cost	4,426
Effect of 0.5 percentage-point decrease in the discount rate on the projected pension benefit obligation	53,420
Effect of 0.5 percentage-point decrease in the long-term rate of return on plan assets on the net periodic pension benefit cost	1,230
Effect of 0.5 percentage-point decrease in the rate of compensation increases on the net periodic pension benefit cost	(2,016)
Effect of 0.5 percentage-point decrease in the rate of compensation increases on the projected pension benefit obligation	(13,522)
Effect of 0.5 percentage-point decrease in the cost of living adjustment on the net periodic pension benefit cost	(3,461)
Effect of 0.5 percentage-point decrease in the cost of living adjustment on the projected pension benefit obligation	(33,374)
Effect of 0.5 percentage-point increase in the discount rate on the net periodic pension benefit cost	(3,938)
Effect of 0.5 percentage-point increase in the discount rate on the projected pension benefit obligation	(46,318)
Effect of 0.5 percentage-point increase in the long-term rate of return on plan assets on the net periodic pension benefit cost	(1,229)
Effect of 0.5 percentage-point increase in the rate of compensation increases on the net periodic pension benefit cost	2,176
Effect of 0.5 percentage-point increase in the rate of compensation increases on the projected pension benefit obligation	14,539
Weighted average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	5.00%	4.10%
Long-term rate of return on assets (as a percent)	6.75%	7.00%
Rate of compensation increase (as a percent)	4.00%	3.50%
Assumed health care cost trend rates affect the amounts reported for the postretirement benefit plans
Estimated annual contributions in next fiscal year	33,032
Pension plans \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	306,344	266,178
Total (as a percent)	100.00%	100.00%
Change in plan assets:
Fair value of plan assets at end of year	306,344	266,178
Pension plans \| Fixed Income
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	40.00%
Pension plans \| Fixed Income \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	119,814	102,288
Total (as a percent)	39.00%	38.00%
Change in plan assets:
Fair value of plan assets at end of year	119,814	102,288
Pension plans \| Fixed Income \| Level 1 \| Money Market Fund Investments
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	3,642	1,287
Change in plan assets:
Fair value of plan assets at end of year	3,642	1,287
Pension plans \| Fixed Income \| Minimum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	35.00%
Pension plans \| Fixed Income \| Maximum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	45.00%
Pension plans \| Total Domestic Equity
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	50.00%
Pension plans \| Total Domestic Equity \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	155,961	137,269
Total (as a percent)	51.00%	52.00%
Change in plan assets:
Fair value of plan assets at end of year	155,961	137,269
Pension plans \| Total Domestic Equity \| Minimum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	40.00%
Pension plans \| Total Domestic Equity \| Maximum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	60.00%
Pension plans \| Small Cap Stocks
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	15.00%
Pension plans \| Small Cap Stocks \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	47,798	40,757
Change in plan assets:
Fair value of plan assets at end of year	47,798	40,757
Pension plans \| Small Cap Stocks \| Minimum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	10.00%
Pension plans \| Small Cap Stocks \| Maximum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	20.00%
Pension plans \| Large Cap Stocks
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	35.00%
Pension plans \| Large Cap Stocks \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	108,163	96,512
Change in plan assets:
Fair value of plan assets at end of year	108,163	96,512
Pension plans \| Large Cap Stocks \| Minimum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	30.00%
Pension plans \| Large Cap Stocks \| Maximum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	45.00%
Pension plans \| Non-U.S. Equities
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	10.00%
Pension plans \| Non-U.S. Equities \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	30,569	26,621
Total (as a percent)	10.00%	10.00%
Change in plan assets:
Fair value of plan assets at end of year	30,569	26,621
Pension plans \| Non-U.S. Equities \| Minimum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	5.00%
Pension plans \| Non-U.S. Equities \| Maximum
Target asset allocation percentages for major categories of the pension plan
Target asset allocation percentages	15.00%
Other benefits
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	59,841	49,939	37,408
Actuarial assumptions used in determining the benefit obligation for the benefit plans
Discount rate (as a percent)	4.00%	5.00%
Long-term rate of return on assets (as a percent)	5.50%	6.00%
Change in projected benefit obligation:
Balance at the beginning of the period	79,066	84,421
Service cost	5,205	5,374	4,399
Interest cost	4,455	3,556	3,139
Assumption change	37,021	(14,366)
Experience loss	11,020	1,455
Benefits paid, net of retiree premiums	(1,534)	(1,374)
Balance at the end of the period	135,233	79,066	84,421
Change in plan assets:
Fair value of plan assets at beginning of year	49,939	37,408
Actual return on plan assets	2,376	4,270
Employer contributions	9,060	9,635
Retiree contributions and Medicare part D subsidies	1,535	1,299
Benefits paid	(3,069)	(2,673)
Fair value of plan assets at end of year	59,841	49,939	37,408
Reconciliation of funded status
Funded status	(75,392)	(29,127)
Unrecognized actuarial loss	70,279	23,311
Unrecognized prior service cost	295	340
Net amount recognized in the balance sheet	(4,818)	(5,476)
Amounts recognized in the consolidated balance sheets:
Accrued benefit costs	(5,476)	(6,219)
Accrued benefit liability	(75,392)	(29,127)
Regulatory asset	76,050	29,870
Net amount recognized in the balance sheet	(4,818)	(5,476)
Average return for last ten years (as a percent)	6.30%
Components of the pension plans and other postretirement benefits
Service cost	5,205	5,374	4,399
Interest cost	4,455	3,556	3,139
Expected return on plan assets	(3,119)	(2,394)	(1,832)
Net amortization and deferral	1,861	2,441	2,425
Net periodic benefit cost	8,402	8,977	8,131
Weighted average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	5.00%	4.20%
Long-term rate of return on assets (as a percent)	6.00%	6.00%
Assumed health care cost trend rates affect the amounts reported for the postretirement benefit plans
Estimated annual contributions in next fiscal year	14,991
Other benefits \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	59,841	49,939
Total (as a percent)	100.00%	100.00%
Change in plan assets:
Fair value of plan assets at end of year	59,841	49,939
Other benefits \| Fixed Income \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	36,313	31,019
Total (as a percent)	61.00%	62.00%
Change in plan assets:
Fair value of plan assets at end of year	36,313	31,019
Other benefits \| Fixed Income \| Level 1 \| Money Market Fund Investments
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	22,115	19,214
Change in plan assets:
Fair value of plan assets at end of year	22,115	19,214
Other benefits \| Total Domestic Equity \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	23,528	18,920
Total (as a percent)	39.00%	38.00%
Change in plan assets:
Fair value of plan assets at end of year	23,528	18,920
Other benefits \| Large Cap Stocks \| Level 1
Target asset allocation percentages for major categories of the pension plan
Fair value of pension plan assets	23,528	18,920
Change in plan assets:
Fair value of plan assets at end of year	$ 23,528	$ 18,920
Other benefits \| Non-U.S. Equities \| Level 1
Target asset allocation percentages for major categories of the pension plan
Total (as a percent)	0.00%	0.00%

Represents the adjustment made to the benefit obligation due to assumption change.

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit costs net of those gains or losses deferred to future periods.

+ References

No definition available.

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- Definition

Represents the cost of living adjustment, an assumption used in determining the benefit obligation for the benefit plans.

+ References

No definition available.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested included in the benefit obligation.

+ References

No definition available.

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Represents the assumed percentage for portfolio investment.

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No definition available.

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- Definition

Represents the average return on investments for last five years.

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No definition available.

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Represents the average return on investments for last ten years.

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No definition available.

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- Definition

Represents the assumed long-term inflation rate.

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No definition available.

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Represents the percentage of expected results within which long-term rate of return falls.

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No definition available.

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- Definition

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No definition available.

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- Definition

Represents the amount of contributions made by plan participants and amount of the period's gross receipts received from the prescription drug subsidy.

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No definition available.

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- Definition

The effect of 0.5 percentage-point decrease in the cost of living adjustment on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point decrease in the cost of living adjustment on the projected pension benefit obligation.

+ References

No definition available.

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- Definition

The effect of 0.5 percentage-point decrease in the discount rate on the net periodic pension benefit cost.

+ References

No definition available.

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- Definition

The effect of 0.5 percentage-point decrease in the discount rate on the projected pension benefit obligation.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point decrease in the long-term rate of return on plan assets on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point decrease in the rate of compensation increases on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point decrease in the rate of compensation increases on the projected pension benefit obligation.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point increase in the discount rate on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point increase in the discount rate on the projected pension benefit obligation.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point increase in the long-term rate of return on plan assets on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point increase in the rate of compensation increases on the net periodic pension benefit cost.

+ References

No definition available.

+ Details

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- Definition

The effect of 0.5 percentage-point increase in the rate of compensation increases on the projected pension benefit obligation.

+ References

No definition available.

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- Definition

The assumed health care cost trend rate by a specified period.

+ References

No definition available.

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- Definition

The period in which the ultimate health care cost trend rate is expected to be reached.

+ References

No definition available.

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- Definition

Represents the amount recognized in balance sheet for prepaid, net of accrued, benefit costs associated with the plan.

+ References

No definition available.

+ Details

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- Definition

Represents the maturity period for majority of fixed income investments which includes, money market funds, short-term bond funds, and cash.

+ References

No definition available.

+ Details

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- Definition

This represents the current liability recognized in the balance sheet that is associated with the defined benefit pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i)

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- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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