Property, Plant and Equipment (Tables)

3 Months Ended

Jun. 30, 2019

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			June 30, 2019			March 31, 2019
	(in years)			(in thousands)
Natural gas liquids terminal and storage assets	2	-	30	$	280,849		$	280,106
Pipeline and related facilities	30	-	40	243,762			243,799
Refined products terminal assets and equipment	15	-	25	15,187			15,187
Vehicles and railcars	3	-	25	122,363			124,948
Water treatment facilities and equipment	3	-	30	734,713			704,666
Crude oil tanks and related equipment	2	-	30	225,599			225,476
Barges and towboats	5	-	30	103,737			103,735
Information technology equipment	3	-	7	33,518			33,082
Buildings and leasehold improvements	3	-	40	145,114			144,567
Land				70,362			63,368
Tank bottoms and line fill (1)				20,267			20,071
Other	3	-	20	15,035			15,018
Construction in progress				447,880			290,832
				2,458,386			2,264,855
Accumulated depreciation				(442,868		)	(420,362		)
Net property, plant and equipment				$	2,015,518		$	1,844,493

(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. Line fill, 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 June 30,
	2019		2018
	(in thousands)
Depreciation expense	$	25,821	$	24,729
Capitalized interest expense	$	—	$	149

Amounts in the table above do not include depreciation expense and capitalized interest related to our former Retail Propane segment, as these amounts have been classified within discontinued operations in our unaudited condensed consolidated statements of operations (see Note 16).

Schedule of (gain) loss on sale of assets

We record (gains) losses from the sales of property, plant and equipment and any write-downs in value due to impairment within (gain) 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 June 30,
	2019			2018
	(in thousands)
Crude Oil Logistics	$	(533	)	$	(2,041	)
Water Solutions	48			2,475
Liquids	(3		)	(10		)
Total	$	(488	)	$	424