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Investments Gross realized gains and losses (Tables)
 9 Months Ended
Sep. 30, 2018
Gain (Loss) on Securities [Line Items]  
Schedule of Realized Gain (Loss) [Table Text Block]
(in thousands)
 
Three months ended September 30,
 
 
Nine months ended September 30,
 
 
 
2018

 
2017

 
2018

 
2017

Gross realized gains
 
$
—

 
$
—

 
$
398

 
$
—

Gross realized losses
 
(414
)
 
—

 
(415
)
 
(1
)
Net realized losses
 
$
(414
)
 
$
—

 
$
(17
)
 
$
(1
)