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Other Income (Expense), Net (Tables)
 6 Months Ended
Jun. 30, 2016
Other Income and Expenses [Abstract]  
Schedule of Other Income (Expense), Net
Other income (expense), net consists of the following:
 
 
THREE MONTHS ENDED 
 JUNE 30,
 
SIX MONTHS ENDED 
 JUNE 30,
(in thousands)
2016
 
2015
 
2016
 
2015
Interest and amortization expense
$
(622
)
 
$
(622
)
 
$
(1,310
)
 
$
(1,239
)
Sale of New Jersey state tax benefit
—

 
—

 
—

 
2,898

Investment and other income, net
140

 
117

 
280

 
238

 
$
(482
)
 
$
(505
)
 
$
(1,030
)
 
$
1,897