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PENSION AND OTHER POSTRETIREMENT BENEFITS - PLAN ASSETS BY CATEGORY (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets $ 144,568 $ 142,674
Fair Value of Plan Assets at Beginning of Year 144,568 142,674
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 149,032 144,568
Pension Benefits | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 28  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 28  
Pension Benefits | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 554 554
Fair Value of Plan Assets at Beginning of Year [1] 554  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 692 554
Pension Benefits | STIF-Type Instrument    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 1,003 1,003
Fair Value of Plan Assets at Beginning of Year [2] 1,003  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [2] 1,096 1,003
Pension Benefits | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 41,000 41,000
Fair Value of Plan Assets at Beginning of Year [1] 41,000  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 41,976 41,000
Pension Benefits | U.S. Large-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 10,380 10,380
Fair Value of Plan Assets at Beginning of Year [3] 10,380  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 11,535 10,380
Pension Benefits | U.S. Mid-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 4,122 4,122
Fair Value of Plan Assets at Beginning of Year [3] 4,122  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 2,748 4,122
Pension Benefits | U.S. Small-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 186 186
Fair Value of Plan Assets at Beginning of Year [3] 186  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 210 186
Pension Benefits | Equity Securities, International Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 2,698 2,698
Fair Value of Plan Assets at Beginning of Year [3] 2,698  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 1,367 2,698
Pension Benefits | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 24,796 24,796
Fair Value of Plan Assets at Beginning of Year [1] 24,796  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 26,800 24,796
Pension Benefits | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 38,740 38,740
Fair Value of Plan Assets at Beginning of Year [1] 38,740  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 40,853 38,740
Pension Benefits | Common/Collective Trust Fund – Real Estate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [4] 5,987 5,987
Fair Value of Plan Assets at Beginning of Year [4] 5,987  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [4] 6,866 5,987
Pension Benefits | Guaranteed Insurance Contract    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [5] 8,738 8,738
Fair Value of Plan Assets at Beginning of Year [5] 8,738  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [5] 8,031 8,738
Pension Benefits | Hedge Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [6] 3,469 3,469
Fair Value of Plan Assets at Beginning of Year [6] 3,469  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [6] 3,353 3,469
Pension Benefits | Private Equity Fund    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [7] 2,895 2,895
Fair Value of Plan Assets at Beginning of Year [7] 2,895  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [7] $ 3,477 2,895
Pension Benefits | Private Equity Fund | Minimum    
Actual return on plan assets:    
Fund Valuations Lag Period 90 days  
Pension Benefits | Private Equity Fund | Maximum    
Actual return on plan assets:    
Fund Valuations Lag Period 120 days  
Pension Benefits | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets $ 17,386 17,386
Fair Value of Plan Assets at Beginning of Year 17,386  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 15,888 17,386
Pension Benefits | Level 1 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 28  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 28  
Pension Benefits | Level 1 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 1 | STIF-Type Instrument    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [2] 0 0
Pension Benefits | Level 1 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 1 | U.S. Large-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 10,380 10,380
Fair Value of Plan Assets at Beginning of Year [3] 10,380  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 11,535 10,380
Pension Benefits | Level 1 | U.S. Mid-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 4,122 4,122
Fair Value of Plan Assets at Beginning of Year [3] 4,122  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 2,748 4,122
Pension Benefits | Level 1 | U.S. Small-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 186 186
Fair Value of Plan Assets at Beginning of Year [3] 186  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 210 186
Pension Benefits | Level 1 | Equity Securities, International Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 2,698 2,698
Fair Value of Plan Assets at Beginning of Year [3] 2,698  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 1,367 2,698
Pension Benefits | Level 1 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 1 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 1 | Common/Collective Trust Fund – Real Estate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [4] 0 0
Fair Value of Plan Assets at Beginning of Year [4] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [4] 0 0
Pension Benefits | Level 1 | Guaranteed Insurance Contract    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [5] 0 0
Fair Value of Plan Assets at Beginning of Year [5] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [5] 0 0
Pension Benefits | Level 1 | Hedge Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [6] 0 0
Fair Value of Plan Assets at Beginning of Year [6] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [6] 0 0
Pension Benefits | Level 1 | Private Equity Fund    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [7] 0 0
Fair Value of Plan Assets at Beginning of Year [7] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [7] 0 0
Pension Benefits | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 106,093 106,093
Fair Value of Plan Assets at Beginning of Year 106,093  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 111,417 106,093
Pension Benefits | Level 2 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0  
Pension Benefits | Level 2 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 554 554
Fair Value of Plan Assets at Beginning of Year [1] 554  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 692 554
Pension Benefits | Level 2 | STIF-Type Instrument    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 1,003 1,003
Fair Value of Plan Assets at Beginning of Year [2] 1,003  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [2] 1,096 1,003
Pension Benefits | Level 2 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 41,000 41,000
Fair Value of Plan Assets at Beginning of Year [1] 41,000  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 41,976 41,000
Pension Benefits | Level 2 | U.S. Large-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 2 | U.S. Mid-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 2 | U.S. Small-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0  
Pension Benefits | Level 2 | Equity Securities, International Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 2 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 24,796 24,796
Fair Value of Plan Assets at Beginning of Year [1] 24,796  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 26,800 24,796
Pension Benefits | Level 2 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 38,740 38,740
Fair Value of Plan Assets at Beginning of Year [1] 38,740  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 40,853 38,740
Pension Benefits | Level 2 | Common/Collective Trust Fund – Real Estate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [4] 0 0
Fair Value of Plan Assets at Beginning of Year [4] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [4] 0 0
Pension Benefits | Level 2 | Guaranteed Insurance Contract    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [5] 0 0
Fair Value of Plan Assets at Beginning of Year [5] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [5] 0 0
Pension Benefits | Level 2 | Hedge Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [6] 0 0
Fair Value of Plan Assets at Beginning of Year [6] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [6] 0 0
Pension Benefits | Level 2 | Private Equity Fund    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [7] 0 0
Fair Value of Plan Assets at Beginning of Year [7] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [7] 0 0
Pension Benefits | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 21,089 20,240
Fair Value of Plan Assets at Beginning of Year 21,089 20,240
Actual return on plan assets:    
Relating to assets still held at the reporting date 514 1,103
Relating to assets sold during the period 367 270
Purchases, Sales and Settlements (243) (524)
Fair Value of Plan Assets at End of Year 21,727 21,089
Pension Benefits | Level 3 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0  
Pension Benefits | Level 3 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 3 | STIF-Type Instrument    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [2] 0 0
Pension Benefits | Level 3 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 3 | U.S. Large-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 3 | U.S. Mid-Cap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 3 | Equity Securities, International Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [3] 0 0
Fair Value of Plan Assets at Beginning of Year [3] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [3] 0 0
Pension Benefits | Level 3 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 3 | Common/Collective Trust Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [1] 0 0
Fair Value of Plan Assets at Beginning of Year [1] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [1] 0 0
Pension Benefits | Level 3 | Common/Collective Trust Fund – Real Estate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 5,987 [4] 5,401
Fair Value of Plan Assets at Beginning of Year 5,987 [4] 5,401
Actual return on plan assets:    
Relating to assets still held at the reporting date 879 586
Relating to assets sold during the period 0 0
Purchases, Sales and Settlements 0 0
Fair Value of Plan Assets at End of Year [4] 6,866 5,987
Pension Benefits | Level 3 | Guaranteed Insurance Contract    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 8,738 [5] 9,071
Fair Value of Plan Assets at Beginning of Year 8,738 [5] 9,071
Actual return on plan assets:    
Relating to assets still held at the reporting date (26) 396
Relating to assets sold during the period 21 10
Purchases, Sales and Settlements (702) (739)
Fair Value of Plan Assets at End of Year [5] 8,031 8,738
Pension Benefits | Level 3 | Hedge Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 3,469 [6] 3,328
Fair Value of Plan Assets at Beginning of Year 3,469 [6] 3,328
Actual return on plan assets:    
Relating to assets still held at the reporting date (116) 141
Relating to assets sold during the period 0 0
Purchases, Sales and Settlements 0 0
Fair Value of Plan Assets at End of Year [6] 3,353 3,469
Pension Benefits | Level 3 | Private Equity Fund    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 2,895 [7] 2,440
Fair Value of Plan Assets at Beginning of Year 2,895 [7] 2,440
Actual return on plan assets:    
Relating to assets still held at the reporting date (223) (20)
Relating to assets sold during the period 346 260
Purchases, Sales and Settlements 459 215
Fair Value of Plan Assets at End of Year [7] 3,477 2,895
Other Postretirement Benefits    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 40,951 39,471
Fair Value of Plan Assets at Beginning of Year 40,951 39,471
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 43,428 40,951
Other Postretirement Benefits | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 142 142
Fair Value of Plan Assets at Beginning of Year 142  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year $ 26 142
Other Postretirement Benefits | Equity Securities, U.S. Securities | Minimum    
Actual return on plan assets:    
Target plan allocations 30.00%  
Other Postretirement Benefits | Equity Securities, U.S. Securities | Maximum    
Actual return on plan assets:    
Target plan allocations 43.00%  
Other Postretirement Benefits | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] $ 10,006 10,006
Fair Value of Plan Assets at Beginning of Year [8] 10,006  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 12,154 10,006
Other Postretirement Benefits | Mutual Fund - U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 4,447 4,447
Fair Value of Plan Assets at Beginning of Year [2] 4,447  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year $ 1,228 [9] 4,447 [2]
Other Postretirement Benefits | Equity Securities, International Securities | Minimum    
Actual return on plan assets:    
Target plan allocations 20.00%  
Other Postretirement Benefits | Equity Securities, International Securities | Maximum    
Actual return on plan assets:    
Target plan allocations 30.00%  
Other Postretirement Benefits | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] $ 7,030 7,030
Fair Value of Plan Assets at Beginning of Year [8] 7,030  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 7,471 7,030
Other Postretirement Benefits | Mutual Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 1,671 1,671
Fair Value of Plan Assets at Beginning of Year [2] 1,671  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year $ 922 [9] 1,671 [2]
Other Postretirement Benefits | Fixed Income Funds | Minimum    
Actual return on plan assets:    
Target plan allocations 32.00%  
Other Postretirement Benefits | Fixed Income Funds | Maximum    
Actual return on plan assets:    
Target plan allocations 42.00%  
Other Postretirement Benefits | Common/Collective Trust Fund – Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] $ 11,059 11,059
Fair Value of Plan Assets at Beginning of Year [8] 11,059  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 11,852 11,059
Other Postretirement Benefits | Fixed Income, Mutual Funds - Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 2,624 2,624
Fair Value of Plan Assets at Beginning of Year [9] 2,624  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] $ 1,352 2,624
Other Postretirement Benefits | Other Investments | Minimum    
Actual return on plan assets:    
Target plan allocations 0.00%  
Other Postretirement Benefits | Other Investments | Maximum    
Actual return on plan assets:    
Target plan allocations 7.00%  
Other Postretirement Benefits | Mutual Funds - REITs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] $ 286 286
Fair Value of Plan Assets at Beginning of Year [9] 286  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 142 286
Other Postretirement Benefits | Company Owned Life Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [10] 3,686 3,686
Fair Value of Plan Assets at Beginning of Year [10] 3,686  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [10] 8,281 3,686
Other Postretirement Benefits | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 9,170 9,170
Fair Value of Plan Assets at Beginning of Year 9,170  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 3,670 9,170
Other Postretirement Benefits | Level 1 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 142 142
Fair Value of Plan Assets at Beginning of Year 142  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 26 142
Other Postretirement Benefits | Level 1 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 1 | Mutual Fund - U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 4,447 4,447
Fair Value of Plan Assets at Beginning of Year [2] 4,447  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 1,228 [9] 4,447 [2]
Other Postretirement Benefits | Level 1 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 1 | Mutual Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 1,671 1,671
Fair Value of Plan Assets at Beginning of Year [2] 1,671  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 922 [9] 1,671 [2]
Other Postretirement Benefits | Level 1 | Common/Collective Trust Fund – Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 1 | Fixed Income, Mutual Funds - Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 2,624 2,624
Fair Value of Plan Assets at Beginning of Year [9] 2,624  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 1,352 2,624
Other Postretirement Benefits | Level 1 | Mutual Funds - REITs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 286 286
Fair Value of Plan Assets at Beginning of Year [9] 286  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 142 286
Other Postretirement Benefits | Level 1 | Company Owned Life Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [10] 0 0
Fair Value of Plan Assets at Beginning of Year [10] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [10] 0 0
Other Postretirement Benefits | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 31,781 31,781
Fair Value of Plan Assets at Beginning of Year 31,781  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 39,758 31,781
Other Postretirement Benefits | Level 2 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 0 0
Fair Value of Plan Assets at Beginning of Year 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 0
Other Postretirement Benefits | Level 2 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 10,006 10,006
Fair Value of Plan Assets at Beginning of Year [8] 10,006  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 12,154 10,006
Other Postretirement Benefits | Level 2 | Mutual Fund - U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 [9] 0 [2]
Other Postretirement Benefits | Level 2 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 7,030 7,030
Fair Value of Plan Assets at Beginning of Year [8] 7,030  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 7,471 7,030
Other Postretirement Benefits | Level 2 | Mutual Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 [9] 0 [2]
Other Postretirement Benefits | Level 2 | Common/Collective Trust Fund – Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 11,059 11,059
Fair Value of Plan Assets at Beginning of Year [8] 11,059  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 11,852 11,059
Other Postretirement Benefits | Level 2 | Fixed Income, Mutual Funds - Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 0 0
Fair Value of Plan Assets at Beginning of Year [9] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 0 0
Other Postretirement Benefits | Level 2 | Mutual Funds - REITs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 0 0
Fair Value of Plan Assets at Beginning of Year [9] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 0 0
Other Postretirement Benefits | Level 2 | Company Owned Life Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [10] 3,686 3,686
Fair Value of Plan Assets at Beginning of Year [10] 3,686  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [10] 8,281 3,686
Other Postretirement Benefits | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 0 0
Fair Value of Plan Assets at Beginning of Year 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 0
Other Postretirement Benefits | Level 3 | Cash    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets 0 0
Fair Value of Plan Assets at Beginning of Year 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 0
Other Postretirement Benefits | Level 3 | Common/Collective Trust Funds – U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 3 | Mutual Fund - U.S.    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 [9] 0 [2]
Other Postretirement Benefits | Level 3 | Common/Collective Trust Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 3 | Mutual Funds - International    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [2] 0 0
Fair Value of Plan Assets at Beginning of Year [2] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year 0 [9] 0 [2]
Other Postretirement Benefits | Level 3 | Common/Collective Trust Fund – Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [8] 0 0
Fair Value of Plan Assets at Beginning of Year [8] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [8] 0 0
Other Postretirement Benefits | Level 3 | Fixed Income, Mutual Funds - Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 0 0
Fair Value of Plan Assets at Beginning of Year [9] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 0 0
Other Postretirement Benefits | Level 3 | Mutual Funds - REITs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [9] 0 0
Fair Value of Plan Assets at Beginning of Year [9] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [9] 0 0
Other Postretirement Benefits | Level 3 | Company Owned Life Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets [10] 0 0
Fair Value of Plan Assets at Beginning of Year [10] 0  
Actual return on plan assets:    
Fair Value of Plan Assets at End of Year [10] $ 0 $ 0
[1] This category represents common/collective trust fund investments through a commingled employee benefit trust (excluding real estate). These commingled funds are not traded publicly; however, the majority of the underlying assets held in these funds are stocks and bonds that are traded on active markets and prices for these assets are readily observable. Also included in these funds are interest rate swaps, asset backed securities, mortgage backed securities and other investments with observable market values. Holdings in these commingled funds are classified as Level 2 investments.
[2] This category represents short-term investment funds held for the purpose of funding disbursement payment arrangements. Underlying assets are valued based on quoted prices in active markets, or where quoted prices are not available, based on models using observable market information. Since not all values can be obtained from quoted prices in active markets, these funds are classified as Level 2 investments.
[3] This category of equity investments represents a managed portfolio of common stock investments in five sectors: telecommunications, electric utilities, gas utilities, water and energy. These common stocks are actively traded on exchanges and price quotes for these shares are readily available. These common stocks are classified as Level 1 investments.
[4] This category represents real estate common/collective trust fund investments through a commingled employee benefit trust. These commingled funds are part of a direct investment in a pool of real estate properties. These funds are valued by investment managers on a periodic basis using pricing models that use independent appraisals from sources with professional qualifications. Since these valuation inputs are not highly observable, the real estate funds are classified as Level 2 investments.
[5] This category represents SJI’s Group Annuity contracts with a nationally recognized life insurance company. The contracts are the assets of the plan, while the underlying assets of the contracts are owned by the contract holder. Valuation is based on a formula and calculation specified within the contract. Since the valuation is based on the reporting entity’s own assumptions, these contracts are classified as Level 3 investments.
[6] This category represents a collection of underlying funds which are all domiciled outside of the United States. All of the underlying fund managers are based in the U.S.; however, they do not necessarily trade only in the U.S. markets. The fair value of these funds is determined by the underlying fund's general partner or manager. These funds are classified as Level 3 investments.
[7] This category represents a limited partnership which includes several investments in U.S. leveraged buyout, venture capital, and special situation funds. Fund valuations are reported on a 90 to 120 day lag and, therefore, the value reported herein represents the market value as of June or September 30, 2015 and 2014, respectively, with cash flow changes through December applied. The fund’s investments are stated at fair value, which is generally based on the valuations provided by the general partners or managers of such investments. Fund investments are illiquid and resale is restricted. These funds are classified as Level 3 investments.
[8] This category represents common/collective trust fund investments through a commingled employee benefit trust (excluding real estate). These commingled funds are not traded publicly; however, the majority of the underlying assets held in these funds are stocks and bonds that are traded on active markets and prices for these assets are readily observable. Also included in these funds are interest rate swaps, asset backed securities, mortgage backed securities and other investments with observable market values. Holdings in these commingled funds are classified as Level 2 investments.
[9] This category represents mutual fund investments. The mutual funds are actively traded on exchanges and price quotes for the shares are readily available. These mutual funds are classified as Level 1 investments.
[10] This category represents Company-owned life insurance policies with a nationally known life insurance company. The value of these policies is backed by a series of common/collective trust funds held by the insurance carrier similar to category (a) above. Holdings in these insurance policies are classified as Level 2 investments.