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Goodwill, Customer Relationships and Trademarks (Tables)
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
Goodwill, customer relationships and trademarks consist of the following amounts as of (in thousands):
 
June 30, 2017
December 31, 2016
Goodwill
$
80,947

$
79,147

Customer relationships - Acquired (1)


Cost
$
64,671

$
63,571

Accumulated amortization
(37,476
)
(31,660
)
Customer relationships - Acquired, net
$
27,195

$
31,911

Customer relationships - Other (2)


Cost
$
9,828

$
4,320

Accumulated amortization
(3,580
)
(2,708
)
Customer relationships - Other, net
$
6,248

$
1,612

Trademarks (3)


Cost
$
6,770

$
6,770

Accumulated amortization
(672
)
(431
)
Trademarks, net
$
6,098

$
6,339

(1) Customer relationships - Acquired represent those customer acquisitions accounted for under the acquisition method in accordance with ASC 805. See Note 3 "Acquisitions" for further discussion.
(2) Customer relationships - Other represent portfolios of customer contracts not accounted for in accordance with ASC 805 as these acquisitions were not in conjunction with the acquisition of businesses.
(3) Trademarks reflect values associated with the recognition and positive reputation of acquired businesses accounted for as part of the acquisition method in accordance with ASC 805 through the acquisitions of CenStar, Oasis, the Provider Companies and the Major Energy Companies. These trademarks are recorded as other assets in the condensed consolidated balance sheets. See Note 3 "Acquisitions" for further discussion.

Changes in goodwill, customer relationships and trademarks consisted of the following (in thousands):


Goodwill (1)
Customer Relationships - Acquired
Customer Relationships - Others
Trademarks
Balance at December 31, 2016
$
79,147

$
31,911

$
1,612

$
6,339

Additions (Major Working Capital Adjustment)
260

—

—

—

Additions (Perigee)
1,540

1,100

5,508

—

Amortization expense
—

(5,816
)
(872
)
(241
)
Balance at June 30, 2017
$
80,947

$
27,195

$
6,248

$
6,098

(1) Changes in goodwill in the six months ended June 30, 2017 include NG&E's working capital settlement with the Major Energy Companies' sellers of $0.3 million and Perigee's goodwill of $1.5 million.
Estimated Future Amortization Expense of Intangible Assets
Estimated future amortization expense for customer relationships and trademarks at June 30, 2017 is as follows (in thousands):
Year ending December 31,

2017
$
7,257

2018
12,393

2019
7,948

2020
3,880

2021
2,811

> 5 years
5,252

Total
$
39,541