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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill And Other Intangible Assets [Abstract]  
Goodwill by Segment
Goodwill relates to the following segments (in thousands):
 
December 31,
 
2015
 
2014
Crude Transportation
$
26,628

 
$
36,116

SemGas
13,052

 
13,052

SemMexico
8,352

 
9,158

Total Goodwill
$
48,032

 
$
58,326
Reconciliation of Goodwill
Changes in goodwill balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands):
Balance, December 31, 2012
$
9,884

Barcas acquisition (Note 6)
28,322

MMGS acquisition (Note 6)
23,839

Currency translation adjustments
(24
)
Balance, December 31, 2013
62,021

Crude oil trucking asset acquisition (Note 6)
7,892

MMGS purchase price allocation adjustment
(10,787
)
Barcas purchase price allocation adjustment
(98
)
Currency translation adjustments
(702
)
Balance, December 31, 2014
58,326

Impairment loss
(9,488
)
Currency translation adjustments
(806
)
Balance, December 31, 2015
$
48,032
Other Intangible Assets by Segment
The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands):
 
December 31, 2015
 
December 31, 2014
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
Customer Relationships
$
188,304

 
$
(26,975
)
 
$
161,329

 
$
189,583

 
$
(17,963
)
 
$
171,620

Trade Names
493

 
(378
)
 
115

 
570

 
(379
)
 
191

Unpatented Technology
2,941

 
(2,162
)
 
779

 
3,457

 
(2,203
)
 
1,254

Total other intangible assets
$
191,738

 
$
(29,515
)
 
$
162,223

 
$
193,610

 
$
(20,545
)
 
$
173,065
Reconciliation of Other Intangible Assets
Changes in other intangible asset balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands):
Balance, December 31, 2012
$
7,585

Amortization
(6,018
)
Barcas acquisition
6,930

MMGS acquisition
166,332

Currency translation adjustments
9

Balance, December 31, 2013
174,838

Amortization
(15,875
)
Crude oil trucking asset acquisition
17,010

MMGS purchase price allocation adjustment
(2,313
)
Barcas purchase price allocation adjustment
(50
)
Currency translation adjustments
(545
)
Balance, December 31, 2014
173,065

Amortization
(10,334
)
Currency translation adjustments
(508
)
Balance, December 31, 2015
$
162,223
Future Amortization of Other Intangible Assets
We estimate that future amortization of other intangible assets will be as follows (in thousands):
For year ending:
 
December 31, 2016
$
10,928

December 31, 2017
11,011

December 31, 2018
10,918

December 31, 2019
10,316

December 31, 2020
9,649

Thereafter
109,401

Total estimated amortization expense
$
162,223