Gross Carrying Amount

Accumulated Amortization

Net Carrying Amount

At March 31, 2016

Intangibles subject to amortization:

Customer relationships

$

2,700

$

952

$

1,748

Intangibles not subject to amortization:

Permits

$

10,300

$

—

$

10,300

Tradename

2,500

—

2,500

$

12,800

$

—

$

12,800

At March 31, 2015

Intangibles subject to amortization:

Customer relationships

$

2,700

$

772

$

1,928

Intangibles not subject to amortization:

Permits

$

10,300

$

—

$

10,300

Tradename

2,500

—

2,500

$

12,800

$

—

$

12,800