Property, Plant and Equipment (Tables)

6 Months Ended

Sep. 30, 2018

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	September 30, 2018			March 31, 2018
		(in thousands)
Natural gas liquids terminal and storage assets	2–30 years	$	235,959		$	238,487
Pipeline and related facilities	30–40 years	244,127			243,616
Refined products terminal assets and equipment	15–25 years	6,736			6,736
Vehicles and railcars	3–25 years	123,614			121,159
Water treatment facilities and equipment	3–30 years	686,547			601,139
Crude oil tanks and related equipment	2–30 years	211,191			218,588
Barges and towboats	5–30 years	102,988			92,712
Information technology equipment	3–7 years	31,987			30,749
Buildings and leasehold improvements	3–40 years	149,605			147,442
Land		99,876			51,816
Tank bottoms and line fill (1)		20,113			20,118
Other	3–20 years	16,042			11,794
Construction in progress		166,384			77,596
		2,095,169			1,861,952
Accumulated depreciation		(388,557		)	(343,345		)
Net property, plant and equipment		$	1,706,612		$	1,518,607

(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.

Amounts in the table above do not include property, plant and equipment and accumulated depreciation related to the Retail Propane segment, as these amounts have been classified as assets held for sale within our unaudited condensed consolidated balance sheets (see Note 14).

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 September 30,				Six Months Ended September 30,
	2018		2017		2018		2017
	(in thousands)
Depreciation expense	$	25,984	$	26,142	$	50,713	$	50,924
Capitalized interest expense	$	173	$	—	$	322	$	—

The table above does not include amounts related to the Retail Propane segment, as these amounts have been classified within discontinued operations in our unaudited condensed consolidated statements of operations (see Note 14).

Schedule of loss (gain) on sale of assets

We record losses (gains) 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 losses (gains) on the disposal or impairment of property, plant and equipment by segment for the periods indicated:

	Three Months Ended September 30,					Six Months Ended September 30,
	2018		2017			2018		2017
	(in thousands)
Crude Oil Logistics	$	3,367	$	(397	)	$	1,326	$	(4,029	)
Water Solutions	730		915			3,205		1,439
Liquids	1,004		852			994		852
Total	$	5,101	$	1,370		$	5,525	$	(1,738	)