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Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]  
Accrued Expenses
Accrued expenses at December 31 consist of the following (in thousands):
 
2018
 
2017
Compensation
$
32,927

 
$
34,752

Interest and taxes
9,231

 
8,002

Customer rebates
10,300

 
10,517

Insurance
7,789

 
7,261

Unearned revenue
12,028

 
3,681

Other
14,799

 
11,254

Total accrued expenses
$
87,074

 
$
75,467