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EMPLOYEE BENEFIT PLANS - Plan assets using fair value hierarchy (Details) - Retirement Income Plan - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy $ 6,032 $ 5,813 $ 6,014
Total      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy 4,520 4,253  
Investments measured at Net Asset Value 1,512 1,560  
Investments at Fair Value 6,032 5,813  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy 975 843  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy 3,545 3,411  
Cash and Cash Equivalents | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [1] 200 39  
Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [1] 200 39  
Cash and Cash Equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [1]  
Fixed Income Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [2] 1,529 1,501  
Fixed Income Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [2]  
Fixed Income Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [2] 1,529 1,501  
Domestic Equity Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [3] 1,539 1,602  
Domestic Equity Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [3] 775 804  
Domestic Equity Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [3] 764 799  
International Equity Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [4] 1,252 1,111  
International Equity Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [4]  
International Equity Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets in the Fair Value Hierarchy [4] $ 1,252 $ 1,111  
[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] Domestic equity securities are valued using a market approach based on the quoted market prices of identical instruments in their respective markets.
[4] International equity securities are valued using a market approach based on the quoted market prices of identical instruments in their respective markets.