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EMPLOYEE BENEFIT PLANS - Plan assets using fair value hierarchy (Details) - Retirement Income Plan - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,813 $ 6,014 $ 5,887
Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,813 6,014  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 844 1,447  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,279 3,766  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 690 801  
Cash and Cash Equivalents | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 39 61  
Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 39 $ 61  
Cash and Cash Equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]  
Cash and Cash Equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]  
Fixed Income Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] $ 1,501 $ 1,459  
Fixed Income Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 589  
Fixed Income Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] $ 1,501 $ 870  
Fixed Income Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]  
Domestic Equity Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2,237 $ 2,226  
Domestic Equity Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 805 797  
Domestic Equity Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,432 $ 1,429  
Domestic Equity Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
International Equity Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] $ 1,346 $ 1,372  
International Equity Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]  
International Equity Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] $ 1,346 $ 1,372  
International Equity Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]  
Real Estate | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] $ 418 $ 631  
Real Estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4]  
Real Estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4]  
Real Estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] $ 418 $ 631  
Real Return | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 95  
Real Return | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]  
Real Return | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 95  
Real Return | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]  
Alternative/Opportunistic/Special | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6] $ 272 $ 170  
Alternative/Opportunistic/Special | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6]  
Alternative/Opportunistic/Special | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6]  
Alternative/Opportunistic/Special | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6] $ 272 $ 170  
[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] International equity 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] Alternative/Opportunistic/Special funds can invest across the capital structure in both liquid and illiquid securities that are valued using a market approach based on the quoted market prices of identical instruments, or if no market price is available, instruments will be held at their fair market value (which may be cost) as reasonably determined by the investment manager, independent dealers, or pricing services.