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Fair Value Disclosures (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures  
Schedule of valuation of financial instruments measured at fair value on a recurring basis
    Fair Value Measurements at December 31, 2015 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   $ —     $ 16,081     $ —  
Available-for-sale securities – equity securities   $ 259     $ —     $ —  
                         
    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     $ —     $ —