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Other Current Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2012
Other Current Accrued Liabilities [Abstract]  
Summary of other current accrued liabilities
The following is a summary of the Company's other current accrued liabilities balances at December 31:
 
(Thousands of dollars)
 
2012
 
 
2011
 
 
 
 
 
 
 
Customer prepayments
 
$
15,681
 
 
$
10,659
 
Litigation reserves
 
 
-
 
 
 
2,743
 
Deferred compensation and benefit plans
 
 
6,918
 
 
 
6,884
 
Acquisition hold back and royalty consideration
 
 
2,330
 
 
 
2,219
 
Other accrued liabilities
 
 
9,054
 
 
 
3,689
 
Total other current accrued liabilities
 
$
33,983
 
 
$
26,194