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Fair Value Disclosures (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures  
Schedule of valuation of financial instruments measured at fair value on a recurring basis
   
Fair Value Measurements at December 31, 2014 with:
  
(in thousands)
  
Quoted prices in 
active markets for 
identical assets
    
Significant other 
observable inputs
    
Significant
unobservable 
inputs
  
   
(Level 1)
    
(Level 2)
    
(Level 3)
  
Assets:
            
Trading securities
  
$
—
    
$
16,491
    
$
—
  
Available-for-sale securities – equity securities
  
$
275
    
$
—
    
$
—
  
 
   
Fair Value Measurements at December 31, 2013 with:
  
(in thousands)
  
Quoted prices in 
active markets for 
identical assets
    
Significant other 
observable inputs
    
Significant 
unobservable 
inputs
  
   
(Level 1)
    
(Level 2)
    
(Level 3)
  
Assets:
            
Trading securities
  
$
—
    
$
13,963
    
$
—
  
Available-for-sale securities – equity securities
  
$
445
    
$
—
    
$
—