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OTHER INCOME
 6 Months Ended
Jun. 30, 2013
Other Income and Expenses [Abstract]  
OTHER INCOME, NET
OTHER INCOME (EXPENSE)

Other income (expense) consisted of the following (amounts in thousands):
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
 
2013
 
2012
 
2013
 
2012
Interest income
$
1,530

 
$
180

 
$
1,931

 
$
385

Discount amortization on prepaid royalty
787

 
933

 
1,703

 
1,972

Other income
468

 
181

 
1,238

 
665

Wheels India Limited equity gain
460

 
—

 
275

 
—

Building rental income
224

 
188

 
404

 
363

Investment gain (loss) related to contractual obligation investments
213

 
(473
)
 
93

 
795

Currency exchange loss
(6,111
)
 
(396
)
 
(6,654
)
 
(456
)
 
$
(2,429
)
 
$
613

 
$
(1,010
)
 
$
3,724



The Company's investment in Wheels India Limited increased from 35.9% to 41.7% during the second quarter of 2013.