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Intangible Assets
 6 Months Ended
Sep. 30, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets

Our intangible assets consist of the following at the dates indicated:
 
 
 
 
 
 
September 30, 2019
 
March 31, 2019
Description
 
Amortizable Lives
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
 
(in years)
 
(in thousands)
Amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
 
3
-
30
 
$
982,932

 
$
(406,049
)
 
$
576,883

 
$
742,832

 
$
(369,983
)
 
$
372,849

Customer commitments
 
10
-
25
 
500,000

 
(92,317
)
 
407,683

 
310,000

 
(74,917
)
 
235,083

Pipeline capacity rights
 
30
 
 
 
7,800

 
(1,517
)
 
6,283

 
7,799

 
(1,387
)
 
6,412

Rights-of-way and easements
 
1
-
45
 
85,001

 
(5,616
)
 
79,385

 
73,409

 
(4,509
)
 
68,900

Water rights
 
13
-
14
 
64,868

 
(5,479
)
 
59,389

 
64,868

 
(3,018
)
 
61,850

Executory contracts and other agreements
 
5
-
30
 
55,030

 
(18,636
)
 
36,394

 
47,230

 
(17,212
)
 
30,018

Non-compete agreements
 
2
-
24
 
19,823

 
(4,363
)
 
15,460

 
12,723

 
(2,570
)
 
10,153

Debt issuance costs (1)
 
5
 
 
 
42,381

 
(32,077
)
 
10,304

 
42,345

 
(29,521
)
 
12,824

Total amortizable
 
 
 
 
 
1,757,835

 
(566,054
)
 
1,191,781

 
1,301,206

 
(503,117
)
 
798,089

Non-amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trade names
 
 
 
 
 
2,800

 
—

 
2,800

 
2,800

 
—

 
2,800

Total
 
 
 
 
 
$
1,760,635

 
$
(566,054
)
 
$
1,194,581

 
$
1,304,006

 
$
(503,117
)
 
$
800,889

 
(1)
Includes debt issuance costs related to the Revolving Credit Facility (as defined herein). Debt issuance costs related to fixed-rate notes and Term Credit Agreement (as defined herein) are reported as a reduction of the carrying amount of long-term debt.

Amounts as of March 31, 2019 in the table above do not include intangible assets and accumulated amortization of TPSL, as these amounts have been classified as noncurrent assets held for sale within our March 31, 2019 unaudited condensed consolidated balance sheet (see Note 16).

The weighted-average remaining amortization period for intangible assets is approximately 16.2 years.

Amortization expense is as follows for the periods indicated:
 
 
Three Months Ended September 30,
 
Six Months Ended September 30,
Recorded In
 
2019
 
2018
 
2019
 
2018
 
 
(in thousands)
Depreciation and amortization
 
$
31,779

 
$
26,766

 
$
60,077

 
$
54,082

Cost of sales
 
88

 
101

 
176

 
283

Interest expense
 
1,280

 
1,225

 
2,556

 
2,418

Operating expenses
 
111

 
—

 
262

 
—

Total
 
$
33,258

 
$
28,092

 
$
63,071

 
$
56,783


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

Expected amortization of our intangible assets is as follows (in thousands):
Fiscal Year Ending March 31,
 
2020 (six months)
$
68,078

2021
124,549

2022
111,700

2023
103,672

2024
97,533

Thereafter
686,249

Total
$
1,191,781