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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The following table represents the changes in goodwill:
 
December 31,
 
2013
 
2012
Beginning balance
$
398,941

 
$
288,770

Foreign currency translation adjustments and other
(344
)
 
408

Goodwill acquired during the year
308

 
109,763

Ending balance
$
398,905

 
$
398,941

The following table represents the changes in goodwill by segment:
 
Energy &
Chemicals
 
Distribution & Storage
 
BioMedical
 
Total
Balance at January 1, 2012
$
83,215

 
$
158,381

 
$
47,174

 
$
288,770

Foreign currency translation adjustments and other
—

 
408

 
—

 
408

Goodwill acquired during the year
—

 
—

 
109,763

 
109,763

Balance at December 31, 2012
83,215

 
158,789

 
156,937

 
398,941

Foreign currency translation adjustments and other
—

 
957

 
(1,301
)
 
(344
)
Goodwill acquired during the year
—

 
308

 
—

 
308

Balance at December 31, 2013
$
83,215

 
$
160,054

 
$
155,636

 
$
398,905
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):
  
Weighted-average
Estimated
Useful Life
 
December 31, 2013
 
December 31, 2012
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Unpatented technology
16.0 years
 
$
43,133

 
$
(11,776
)
 
$
45,078

 
$
(11,286
)
Patents
11.0 years
 
7,904

 
(5,397
)
 
9,880

 
(6,664
)
Product names
9.0 years
 
9,244

 
(4,525
)
 
9,068

 
(2,712
)
Customer relations
13.0 years
 
159,143

 
(73,460
)
 
158,005

 
(59,668
)
Total finite-lived intangible assets
13.6 years
 
$
219,424

 
$
(95,158
)
 
$
222,031

 
$
(80,330
)
Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks and trade names
 
 
$
47,876

 
 
 
$
47,762

 
 
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,
 
2014
$
17,800

2015
16,200

2016
14,300

2017
13,400

2018
12,700