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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Cost and carrying value of available-for-sale investments
The cost and carrying value of available-for-sale investments were as follows (in thousands):
December 31, 2017
Cost
 
Gross Unrealized
 Gains
 
Gross Unrealized
 Losses
 
Carrying Value
Debt securities: corporate bonds
$
700

 
$
6

 
$
(22
)
 
$
684

Marketable equity securities
513

 
710

 
(5
)
 
1,218

Total
$
1,213

 
$
716

 
$
(27
)
 
$
1,902


December 31, 2016
Cost
 
Gross Unrealized
 Gains
 
Gross Unrealized
 Losses
 
Carrying Value
Debt securities: corporate bonds
$
4,306

 
$
82

 
$
(6
)
 
$
4,382

Marketable equity securities
10,400

 
10,327

 
(38
)
 
20,689

Total
$
14,706

 
$
10,409

 
$
(44
)
 
$
25,071
Amortized cost and carrying value of investments in debt securities, by contractual maturity
The amortized cost and carrying value of investments in debt securities, by contractual maturity, are shown below. Actual maturity dates may differ from contractual maturity dates because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties (in thousands):
 
December 31, 2017
 
December 31, 2016
 
Amortized Cost
 
Carrying Value
 
Amortized Cost
 
Carrying Value
Due in one year or less
$
225

 
$
204

 
$
182

 
$
183

Due after one year through five years
475

 
480

 
4,124

 
4,199

 
$
700

 
$
684

 
$
4,306

 
$
4,382
Net realized gain or loss on investments
Included in other income, net in the accompanying consolidated financial statements is the net realized gain or loss on investments (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Gross realized gains:
 
 
 
 
 
Debt securities
$
77

 


 
$
419

Equity securities and other investments
9,746

 
$
610

 
1,010

Total gain
9,823

 
610

 
1,429

Gross realized losses:
 
 
 
 
 
Debt securities
(87
)
 
(90
)
 
(4
)
Equity securities and other investments (1)
(1,014
)
 
(4,525
)
 
(21,020
)
Total loss
(1,101
)
 
(4,615
)
 
(21,024
)
Net realized gain (loss)
$
8,722

 
$
(4,005
)
 
$
(19,595
)

(1) Included within this caption for the years ended December 31, 2016 and 2015 is $2.2 million and $20.7 million, respectively, that is reported in a separate line, impairment loss on unconsolidated affiliate, within the Company’s consolidated statements of operations and comprehensive income or loss for the years then ended.