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Deferred Acquisition Costs (Tables)
 6 Months Ended
Jun. 30, 2017
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 six months ended June 30, 2017 and June 30, 2016 are comprised as follows:
(in thousands)
 
Three months ended June 30,
 
 
Six months ended June 30,
 
 
 
2017

 
2016

 
2017

 
2016

Beginning balance, net
 
$
14,113

 
$
13,440

 
$
13,609

 
$
12,143

Additions
 
7,011

 
7,180

 
14,698

 
14,769

Amortization
 
(7,415
)
 
(6,796
)
 
(14,598
)
 
(13,088
)
Balance at June 30, net
 
$
13,709

 
$
13,824

 
$
13,709

 
$
13,824