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Investments Gross realized gains and losses (Tables)
 6 Months Ended
Jun. 30, 2017
Gain (Loss) on Investments [Line Items]  
Schedule of Realized Gain (Loss) [Table Text Block]
(in thousands)
 
Three months ended June 30,
 
 
Six months ended June 30,
 
 
 
2017

 
2016

 
2017

 
2016

Gross realized gains
 
$
735

 
$
214

 
$
1,159

 
$
248

Gross realized losses
 
(1
)
 
(147
)
 
(27
)
 
(352
)
Net realized gains (losses)
 
$
734

 
$
67

 
$
1,132

 
$
(104
)