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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill And Other Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block]
Changes in goodwill balances during the period from December 31, 2013 to December 31, 2016 are shown below (in thousands):
Balance, December 31, 2013
$
62,021

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

Mid-America Midstream Gas Services ("MMGS") purchase price allocation adjustment
(10,787
)
Barcas purchase price allocation adjustment
(98
)
Currency translation adjustments
(702
)
Balance, December 31, 2014
58,326

Crude oil trucking impairment loss
(9,488
)
Currency translation adjustments
(806
)
Balance, December 31, 2015
48,032

SemGas impairment loss
(13,052
)
Currency translation adjustments
(750
)
Balance, December 31, 2016
$
34,230

Goodwill relates to the following segments (in thousands):
 
December 31,
 
2016
 
2015
Crude Transportation
$
26,628

 
$
26,628

SemGas
—

 
13,052

SemMexico
7,602

 
8,352

Total Goodwill
$
34,230

 
$
48,032
Other Intangible Assets by Segment
Changes in other intangible asset balances during the period from December 31, 2013 to December 31, 2016 are shown below (in thousands):
Balance, December 31, 2013
$
174,838

Amortization
(15,875
)
Crude oil trucking asset acquisition (Note 6)
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

Amortization
(10,928
)
Currency translation adjustments
(317
)
Balance, December 31, 2016
$
150,978

The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands):
 
December 31, 2016
 
December 31, 2015
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Customer Relationships
$
187,114

 
$
(36,601
)
 
$
150,513

 
$
188,304

 
$
(26,975
)
 
$
161,329

Trade Names
421

 
(366
)
 
55

 
493

 
(378
)
 
115

Unpatented Technology
2,461

 
(2,051
)
 
410

 
2,941

 
(2,162
)
 
779

Total other intangible assets
$
189,996

 
$
(39,018
)
 
$
150,978

 
$
191,738

 
$
(29,515
)
 
$
162,223
Future Amortization of Other Intangible Assets
We estimate that future amortization of other intangible assets will be as follows (in thousands):
For the year ending:
 
December 31, 2017
$
11,011

December 31, 2018
10,918

December 31, 2019
10,316

December 31, 2020
9,649

December 31, 2021
9,483

Thereafter
99,601

Total estimated amortization expense
$
150,978