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Investments Change in fair value of equity investments (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]
ain on change in fair value of equity investments for the three and six months ended June 30, 2018 and June 30, 2017 is comprised as follows:
(in thousands)
 
Three months ended June 30,
 
 
Six months ended June 30,
 
 
 
2018

 
2017

 
2018

 
2017

Net (losses) gains recognized on equity investments sold during the period
 
$
(10
)
 
$
—

 
$
245

 
$
—

Change in unrealized (losses) gains on equity investments held at end of the period
 
(411
)
 
—

 
499

 
—

(Loss) gain on change in fair value of equity investments
 
$
(421
)
 
$
—

 
$
744

 
$
—