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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2019

INVESTMENTS

Schedule of changes in equity method investment

​

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​	​	2019			2018			2017
​	​	(in thousands)
Beginning balance	​	$	28,974	​	$	14,182	​	$	—
Contributions	​	​	—	​	​	15,600	​	​	14,400
Equity method investment income (loss)	​	​	2,203	​	​	547	​	​	(218)
Distributions received	​	​	(2,648)	​	​	(1,355)	​	​	—
Ending balance	​	$	28,529	​	$	28,974	​	$	14,182

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Tabular disclosure of changes in the carrying amount of equity method investment.

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