Property, Plant and Equipment (Tables)

9 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

Our property, plant and equipment consists of the following at the dates indicated:

Description	Estimated Useful Lives			December 31, 2021		March 31, 2021
	(in years)			(in thousands)
Natural gas liquids terminal and storage assets	2	-	30	$	165,986	$	319,554
Pipeline and related facilities	30	-	40	264,606		264,405
Vehicles and railcars	3	-	25	124,784		126,088
Water treatment facilities and equipment	3	-	30	2,047,382		1,930,437
Crude oil tanks and related equipment	2	-	30	236,190		238,924
Barges and towboats	5	-	30	138,006		137,386
Information technology equipment	3	-	7	47,087		50,220
Buildings and leasehold improvements	3	-	40	153,584		165,679
Land				100,214		100,352
Tank bottoms and linefill (1)				30,294		20,237
Other	3	-	20	15,290		15,054
Construction in progress				48,293		114,796
				3,371,716		3,483,132
Accumulated depreciation				(887,840)		(776,279)
Net property, plant and equipment				$	2,483,876	$	2,706,853

(1)    Tank bottoms, which are product volumes required for the operation of storage tanks, are recorded at historical cost. We recover tank bottoms when the storage tanks are removed from service. Linefill, which represents our portion of the product volume required for the operation of the proportionate share of a pipeline we own, is recorded at historical cost.

Schedule of depreciation expense and capitalized interest expense

The following table summarizes depreciation expense and capitalized interest expense for the periods indicated:

	Three Months Ended December 31,				Nine Months Ended December 31,
	2021		2020		2021		2020
	(in thousands)
Depreciation expense	$	48,404	$	45,139	$	156,855	$	145,152
Capitalized interest expense	$	149	$	450	$	805	$	2,563

Schedule of (gain) loss on disposal or impairment of assets

We record (gains) losses from the sales of property, plant and equipment and any write-downs in value due to impairment within loss on disposal or impairment of assets, net in our unaudited condensed consolidated statements of operations. The following table summarizes (gains) losses on the disposal or impairment of property, plant and equipment by segment for the periods indicated:

	Three Months Ended December 31,				Nine Months Ended December 31,
	2021		2020		2021		2020
	(in thousands)
Water Solutions	$	13,238	$	(17,877)	$	22,023	$	(11,137)
Crude Oil Logistics	2,245		(72)		2,189		1,772
Liquids Logistics	(3)		(43)		11,750		4
Corporate and Other	—		1		—		(1)
Total	$	15,480	$	(17,991)	$	35,962	$	(9,362)