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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Schedule of Selected Information for Each Business Segment

Selected information for each operating segment is as follows:

 

     Three Months Ended  
     March 31,  

(in thousands)

    2017      2016  

Revenues from external customers

      

U.S.

    $ 71,027      $ 64,933  

International

      10,332        11,541  
  

 

 

     

 

 

  

Total revenues from external customers

    $ 81,359      $ 76,474  
  

 

 

     

 

 

  

Operating income

      

U.S.

    $ 11,168      $ 11,398  

International

      759        6,275  
  

 

 

     

 

 

  

Operating income

      11,927        17,673  

Interest expense

      (5,420 )       (7,024 ) 

Loss on extinguishment of debt

      (2,161 )       —    

Other income

      577        64  
  

 

 

     

 

 

  

Income before income taxes

    $ 4,923      $ 10,713