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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Advertising Costs
Advertising costs for the three and nine months ended September 30, 2017 and 2016, are reflected in the following table (in thousands):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Advertising costs
$
12,051
 
 
$
12,572

 
$
35,747

 
$
35,916