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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2013
EMPLOYEE BENEFIT PLANS  
Summary of target asset allocation percentages for major categories of the pension plan

 

 

 
   Minimum
Exposure		   Target   Maximum
Exposure		  

Fixed Income

     35 %   40 %   45 %

Total Domestic Equity

     40 %   50 %   60 %

Small Cap Stocks

     10 %   15 %   20 %

Large Cap Stocks

     30 %   35 %   45 %

Non-U.S. Equities

     5 %   10 %   15 %
Schedule of fair value plan assets

 

 

 
   Pension Benefits   Other Benefits  
 
   2013   %   2012   %   2013   %   2012   %  

Fixed Income

   $ 102,288     38 % $ 79,391     39 % $ 31,019     62 % $ 22,845     61 %
                                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Domestic Equity

                                                  

Small Cap Stocks

     40,757           33,949           —           —        

Large Cap Stocks

     96,512           69,406           18,920           14,563        
                                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Domestic Equity

     137,269     52 %   103,355     51 %   18,920     38 %   14,563     39 %
                                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Non U.S. Equities

     26,621     10 %   20,201     10 %   —     0 %   —     0 %
                                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Plan Assets

   $ 266,178     100 % $ 202,947     100 % $ 49,939     100 % $ 37,408     100 %
                                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                   
Schedule of reconciliation of the funded status of the plans with the accrued pension liability and the net postretirement benefit liability

 

 

 
   Pension Benefits   Other Benefits  
 
   2013   2012   2013   2012  

Change in projected benefit obligation:

                          

Beginning of year

   $ 402,121   $ 346,305   $ 84,421   $ 69,107  

Service cost

     17,780     15,450     5,374     4,399  

Interest cost

     16,354     15,287     3,556     3,139  

Assumption change

     (53,887 )   24,269     (14,366 )   7,673  

Experience loss

     6,021     4,833     1,455     1,250  

Benefits paid, net of retiree premiums

     (5,191 )   (4,023 )   (1,374 )   (1,147 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

End of year

   $ 383,198   $ 402,121   $ 79,066   $ 84,421  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in plan assets:

                          

Fair value of plan assets at beginning of year

   $ 202,947   $ 155,749   $ 37,408   $ 26,978  

Actual return on plan assets

     36,637     21,979     4,270     2,788  

Employer contributions

     31,785     29,242     9,635     8,789  

Retiree contributions and Medicare part D subsidies

     —     —     1,299     1,255  

Benefits paid

     (5,191 )   (4,023 )   (2,673 )   (2,402 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Fair value of plan assets at end of year

   $ 266,178   $ 202,947   $ 49,939   $ 37,408  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Funded status(1)

   $ (117,020 ) $ (199,174 ) $ (29,127 ) $ (47,013 )

Unrecognized actuarial loss

     53,882     133,579     23,311     40,449  

Unrecognized prior service cost

     36,116     41,972     340     421  

Unrecognized transition obligation

     —     —     —     9  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net amount recognized

   $ (27,022 ) $ (23,623 ) $ (5,476 ) $ (6,134 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
(1)
The short-term portion of the pension benefits was $1,751 and $1,286 as of December 31, 2013 and 2012, respectively.
Schedule of amounts recognized in consolidated balance sheets

 

 

 
   Pension Benefits   Other Benefits  
 
   2013   2012   2013   2012  

(Accrued) benefit costs

   $ —   $ —   $ (6,219 ) $ (6,723 )

Accrued benefit liability

     (117,020 )   (199,174 )   (29,127 )   (47,013 )

Regulatory asset

     89,998     175,551     29,870     47,602  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net amount recognized

   $ (27,022 ) $ (23,623 ) $ (5,476 ) $ (6,134 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of actuarial assumptions used in determining the benefit obligation

 

 

 
   Pension
Benefits		   Other
Benefits		  
 
   2013   2012   2013   2012  

Weighted average assumptions as of December 31:

                          

Discount rate

     5.00 %   4.10 %   5.00 %   4.20 %

Long-term rate of return on plan assets

     6.75 %   7.00 %   6.00 %   6.00 %

Rate of compensation increases

     4.00 %   3.50 %   —     —  

Cost of living adjustment

     3.00 %   3.00 %   —     —  
Schedule of sensitivity of pension amounts to changes in actuarial assumptions

 

 

 
   Increase/(Decrease)
in Pension Actuarial
Assumption		   Increase/(Decrease)
in 2013 Net Periodic
Pension Benefit Cost		   Increase/(Decrease)
in Projected
Pension Benefit
Obligation as of
December 31, 2013		  

Discount rate

     (0.5 )% $ 4,899   $ 35,752  

Long-term rate of return on plan assets

     (0.5 )%   1,018     —  

Rate of compensation increases

     (0.5 )%   (2,181 )   (10,186 )

Cost of living adjustment

     (0.5 )%   (3,685 )   (22,029 )

Discount rate

     0.5 %   (4,334 )   (31,486 )

Long-term rate of return on plan assets

     0.5 %   (1,018 )   —  

Rate of compensation increases

     0.5 %   2,364     10,908  
Components of net periodic benefit costs for the pension and other postretirement plans

 

 

 
   Pension Plan   Other Benefits  
 
   2013   2012   2011   2013   2012   2011  

Service cost

   $ 17,780   $ 15,450   $ 11,713   $ 5,374   $ 4,399   $ 3,199  

Interest cost

     16,354     15,287     14,683     3,556     3,139     2,872  

Expected return on plan assets

     (14,252 )   (11,558 )   (8,949 )   (2,394 )   (1,832 )   (1,372 )

Net amortization and deferral

     15,302     14,283     10,387     2,441     2,425     1,592  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

   $ 35,184   $ 33,462   $ 27,834   $ 8,977   $ 8,131   $ 6,291  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           
Schedule of actuarial assumptions used in determining the net periodic benefit costs

 

 

 
   Pension
Benefits		   Other
Benefits		  
 
   2013   2012   2013   2012  

Weighted average assumptions as of December 31:

                          

Discount rate

     4.10 %   4.40 %   4.20 %   4.50 %

Long-term rate of return on plan assets

     7.00 %   7.00 %   6.00 %   6.25 %

Rate of compensation increases

     3.50 %   3.50 %   —     —  
Schedule of the effect of a one-percentage point change in assumed health care cost trends

 

 

 
   1-Percentage
Point Increase		   1-Percentage
Point (Decrease)		  

Effect on total service and interest costs

   $ 2,656   $ (1,936 )

Effect on accumulated postretirement benefit obligation

   $ 18,085   $ (13,805 )