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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2020

INVESTMENTS

Schedule of changes in equity method investment

​

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​	​	2020			2019			2018
​	​	(in thousands)
Beginning balance	​	$	28,529	​	$	28,974	​	$	14,182
Contributions	​	​	—	​	​	—	​	​	15,600
Equity method investment income	​	​	907	​	​	2,203	​	​	547
Distributions received	​	​	(1,895)	​	​	(2,648)	​	​	(1,355)
Other	​	​	(273)	​	​	—	​	​	—
Ending balance	​	$	27,268	​	$	28,529	​	$	28,974

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