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Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Level 1    
Assets:    
Equity securities $ 9,445 $ 8,716
Assets at fair value 9,445 8,716
Level 2    
Assets:    
Equity securities 0 0
Assets at fair value 0 0
Level 3    
Assets:    
Equity securities 0 0
Assets at fair value 0 0
Total    
Assets:    
Equity securities 9,445 8,716
Assets at fair value $ 9,445 $ 8,716