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OTHER INCOME (EXPENSE), NET
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
OTHER INCOME, NET
OTHER INCOME, NET

Other income, net consisted of the following (in thousands):
 
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Gain on sale of cryptocurrencies
 
$
4,816

 
$
—

 
$
—

Club O Rewards and gift card breakage
 
2,742

 
16,808

 
5,911

Gain (loss) on investment in precious metals
 
1,971

 
201

 
(1,183
)
Ineffective portion loss of cash flow hedge
 
—

 
—

 
(124
)
Other
 
(400
)
 
22

 
(970
)
Early extinguishment costs of long term debts
 
(2,464
)
 
—

 
—

Loss on impairment of cost method investments
 
(5,487
)
 
(2,850
)
 
—

Total other income, net
 
$
1,178

 
$
14,181

 
$
3,634