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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill And Other Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block] Changes in goodwill balances during the period from December 31, 2015 to December 31, 2018 are shown below (in thousands):
Balance, December 31, 2015
$
48,032

U.S. Gas impairment loss
(13,052
)
Currency translation adjustments
(750
)
Balance, December 31, 2016
34,230

U.S. Liquids - Crude oil trucking impairment loss
(26,628
)
Reclassification of Mexican asphalt business goodwill as held for sale (Note 4)
(7,808
)
U.S. Liquids - HFOTCO acquisition (Note 5)
257,302

Currency translation adjustments
206

Balance, December 31, 2017
257,302

Balance, December 31, 2018
$
257,302
Schedule of Other Intangible Assets The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands):

 
December 31, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Customer relationships
$
424,000

 
$
(67,917
)
 
$
356,083

 
$
424,000

 
$
(49,717
)
 
$
374,283

Non-compete agreement
30,000

 
(21,250
)
 
8,750

 
30,000

 
(6,250
)
 
23,750

Trade names
52

 
(47
)
 
5

 
52

 
(42
)
 
10

Customer contract
1,000

 
(800
)
 
200

 
1,000

 
(400
)
 
600

Total other intangible assets
$
455,052

 
$
(90,014
)
 
$
365,038

 
$
455,052

 
$
(56,409
)
 
$
398,643

Changes in other intangible asset balances during the period from December 31, 2015 to December 31, 2018, are shown below (in thousands):
Balance, December 31, 2015
$
162,223

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

U.S. Liquids - HFOTCO acquisition (Note 5)
291,000

U.S. Liquids - 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

Amortization
(33,605
)
Balance, December 31, 2018
$
365,038
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, 2019
$
39,455

December 31, 2020
30,000

December 31, 2021
30,200

December 31, 2022
28,600

December 31, 2023
27,100

Thereafter
209,683

Total estimated amortization expense
$
365,038