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Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures  
Schedule of valuation of financial instruments measured at fair value on a recurring basis
 Fair Value Measurements at December 31, 2018 with: 
(in thousands) Total  Quoted prices in
active markets
for identical
assets
  Significant 
other
observable
inputs
  Significant
unobservable
inputs
 
     (Level 1)  (Level 2)  (Level 3) 
Assets:                
Available-for-sale securities – equity securities $211  $211  $  $ 
Investments measured at net asset value - trading securities $22,815             

 

  Fair Value Measurements at December 31, 2017 with: 
(in thousands) Total  Quoted prices in 
active markets
for identical 
assets
  

Significant
other

observable
inputs

  

Significant

unobservable
inputs

 
     (Level 1)  (Level 2)  (Level 3) 
Assets:                
Available-for-sale securities – equity securities $270  $270  $  $ 
Investments measured at net asset value - trading securities $23,463