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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2016
Other Liabilities, Current [Abstract]  
Other current liabilities
Other current liabilities are as follows (in thousands):

 
 
2016
 
2015
Accrued interest expense                                                                        
 
$
21,074

 
$
23,644

Accrued customer rebates                                                                        
 
21,126

 
20,591

Restructuring liabilities                                                                        
 
5,477

 
3,198

Other accrued liabilities                                                                        
 
35,222

 
41,381

 
 
$
82,899

 
$
88,814