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BENEFIT PLANS: Information about Plan Assets, Reconciliation of Fair Value of Level 3 Securities (Details) - Pension Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance $ 559,719 $ 545,092
Fair value of plan assets, ending balance 559,616 559,719
Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance 71,114 61,728
Defined Benefit Plan Realized Gains 2,820 2,296
Defined Benefit Plan Unrealized (Losses) Gains 41 760
Purchases of Plan Assets 3,178 6,240
Settlements of Plan Assets   90
Sales of Plan Assets (802)  
Fair value of plan assets, ending balance 76,351 71,114
Real Estate    
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance 33,996  
Fair value of plan assets, ending balance 39,035 33,996
Real Estate | Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance 33,996 28,019
Defined Benefit Plan Realized Gains 923 866
Defined Benefit Plan Unrealized (Losses) Gains 3,193 1,305
Purchases of Plan Assets 923 3,806
Settlements of Plan Assets   0
Sales of Plan Assets 0  
Fair value of plan assets, ending balance 39,035 33,996
Private market investments    
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance 37,118  
Fair value of plan assets, ending balance 37,316 37,118
Private market investments | Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure    
Fair value of plan assets, beginning balance 37,118 33,709
Defined Benefit Plan Realized Gains 1,897 1,430
Defined Benefit Plan Unrealized (Losses) Gains (3,152) (545)
Purchases of Plan Assets 2,255 2,434
Settlements of Plan Assets   90
Sales of Plan Assets (802)  
Fair value of plan assets, ending balance $ 37,316 $ 37,118