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Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures  
Schedule of valuation of financial instruments measured at fair value on a recurring basis
    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                          
 
          Fair Value Measurements at December 31, 2016 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   $ 264     $ 264     $     $  
Investments measured at net asset value - trading securities   $ 18,367