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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The following table represents the changes in goodwill by segment:
 
Energy &
Chemicals
 
Distribution & Storage
 
BioMedical
 
Total
Balance at December 31, 2014
$
92,638

 
$
157,248

 
$
155,636

 
$
405,522

Foreign currency translation adjustments and other
(36
)
 
(2,407
)
 
—

 
(2,443
)
Goodwill acquired during the year
—

 
181

 
—

 
181

Balance at March 31, 2015
$
92,602

 
$
155,022

 
$
155,636

 
$
403,260
Schedule Of Finite Lived And Indefinite Lived Intangible Assets [Table Text Block]
The following table displays the gross carrying amount and accumulated amortization for finite-lived intangible assets and indefinite-lived intangible assets (exclusive of goodwill)(1):
 
March 31, 2015
 
December 31, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Finite-lived intangible assets:
 
 
 
 
 
 
 
Unpatented technology
$
33,915

 
$
(5,648
)
 
$
35,933

 
$
(6,979
)
Patents
7,766

 
(6,377
)
 
7,809

 
(6,213
)
Trademarks and trade names
8,870

 
(6,479
)
 
8,981

 
(6,206
)
Non-compete agreements
419

 
(168
)
 
421

 
(88
)
Customer relations
157,051

 
(88,343
)
 
157,533

 
(85,187
)
Total finite-lived intangible assets
$
208,021

 
$
(107,015
)
 
$
210,677

 
$
(104,673
)
Indefinite-lived intangible assets:
 
 
 
 
 
 
 
Trademarks and trade names
$
47,477

 
 
 
$
47,662

 
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The Company estimates amortization expense to be recognized during the next five years as follows:
For the Year Ending December 31,
 
2015
$
16,100

2016
14,200

2017
13,300

2018
12,500

2019
12,400