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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill And Other Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block]
Changes in goodwill balances during the period from December 31, 2014 to December 31, 2017 are shown below (in thousands):
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

Crude oil trucking impairment loss
(26,628
)
Reclassification of SemMexico goodwill as held for sale (Note 4)
(7,808
)
HFOTCO acquisition (Note 5)
257,302

Currency translation adjustments
206

Balance, December 31, 2017
$
257,302

Goodwill relates to the following segments (in thousands):
 
December 31,
 
2017
 
2016
Crude Transportation
$
—

 
$
26,628

HFOTCO
257,302

 
—

Corporate and Other
—

 
7,602

Total goodwill
$
257,302

 
$
34,230
Other Intangible Assets by Segment
The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands):
 
December 31, 2017
 
December 31, 2016
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Customer relationships
$
424,000

 
$
(49,717
)
 
$
374,283

 
$
187,114

 
$
(36,601
)
 
$
150,513

Non - compete agreement
30,000

 
(6,250
)
 
23,750

 
—

 
—

 
—

Trade names
52

 
(42
)
 
10

 
421

 
(366
)
 
55

Customer contract
1,000

 
(400
)
 
600

 
—

 
—

 
—

Unpatented technology
—

 
—

 
—

 
2,461

 
(2,051
)
 
410

Total other intangible assets
$
455,052

 
$
(56,409
)
 
$
398,643

 
$
189,996

 
$
(39,018
)
 
$
150,978

Changes in other intangible asset balances during the period from December 31, 2014 to December 31, 2017 are shown below (in thousands):
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

HFOTCO acquisition (Note 5)
291,000

Crude oil trucking impairment
(12,087
)
Reclassification of Mexican asphalt assets as held for sale (Note 4)
(715
)
Amortization
(30,628
)
Currency translation adjustments
95

Balance, December 31, 2017
$
398,643
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, 2018
$
33,605

December 31, 2019
39,455

December 31, 2020
30,000

December 31, 2021
30,200

December 31, 2022
28,600

Thereafter
236,783

Total estimated amortization expense
$
398,643