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EMPLOYEE BENEFIT PLANS - Plan assets using fair value hierarchy (Details) (Retirement Income Plan, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,887 $ 5,282 $ 4,313
Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,887 5,282  
Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,597 2,003  
Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,799 2,790  
Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 491 489  
Cash and Cash Equivalents | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38 [1] 11 [1]  
Cash and Cash Equivalents | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38 [1] 11 [1]  
Cash and Cash Equivalents | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [1]    [1]  
Cash and Cash Equivalents | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [1]    [1]  
Fixed Income Securities | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,490 [2] 1,065 [2]  
Fixed Income Securities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [2]    [2]  
Fixed Income Securities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,490 [2] 1,065 [2]  
Fixed Income Securities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [2]    [2]  
Domestic Equity Securities | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,559 801  
Domestic Equity Securities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,559 801  
Domestic Equity Securities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets        
Domestic Equity Securities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets        
Global Equity Securities | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3] 796 [3]  
Global Equity Securities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3] 796 [3]  
Global Equity Securities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3]    [3]  
Global Equity Securities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3]    [3]  
International Equity Securities | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,850 [3] 848 [3]  
International Equity Securities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3] 395 [3]  
International Equity Securities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,850 [3] 453 [3]  
International Equity Securities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [3]    [3]  
Real Estate | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 491 [4] 489 [4]  
Real Estate | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [4]    [4]  
Real Estate | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [4]    [4]  
Real Estate | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 491 [4] 489 [4]  
Real Return | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 459 [5] 475 [5]  
Real Return | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [5]    [5]  
Real Return | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 459 [5] 475 [5]  
Real Return | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [5]    [5]  
Tactical Composite | Total
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [6] 797 [6]  
Tactical Composite | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [6]    [6]  
Tactical Composite | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [6] 797 [6]  
Tactical Composite | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets    [6]    [6]  
[1] Cash and cash equivalents, which are used to pay benefits and plan administrative expenses, are held in Rule 2a-7 money market funds.
[2] Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
[3] Global equity securities and certain international securities are valued using a market approach based on the quoted market prices of similar instruments in their respective markets.
[4] Real estate fund values are primarily reported by the fund manager and are based on valuation of the underlying investments, which include inputs such as cost, discounted future cash flows, independent appraisals and market based comparable data.
[5] Real return funds invest in global equities, commodities and inflation protected core bonds that are valued primarily using a market approach based on the quoted market prices of identical instruments in their respective markets.
[6] Tactical composite funds invest in stocks, bonds and cash, both domestic and international. These assets are valued primarily using a market approach based on the quoted market prices of identical instruments in their respective markets.