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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
3 Months Ended
Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Carrying values of investments in unconsolidated entities
The carrying values of investments in unconsolidated affiliates, categorized by type of investment, is as follows (in thousands):
 
March 31, 2019
 
December 31, 2018
Equity method investment
$
4,819

 
$
5,000

Non-marketable equity security investment
3,018

 
3,018

 
$
7,837

 
$
8,018