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Deferred Acquisition Costs (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Acquisition Costs [Line Items]  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
The components of deferred acquisition costs and the related amortization expense for the three and nine months ended September 30, 2018 and September 30, 2017 are comprised as follows:
(in thousands)
 
Three months ended September 30,
 
 
Nine months ended September 30,
 
 
 
2018

 
2017

 
2018

 
2017

Beginning balance, net
 
$
6,662

 
$
6,054

 
$
6,325

 
$
5,827

Additions
 
1,047

 
1,255

 
3,545

 
3,572

Amortization
 
(810
)
 
(1,068
)
 
(2,971
)
 
(3,158
)
Balance at September 30, net
 
$
6,899

 
$
6,241

 
$
6,899

 
$
6,241