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Acquisitions and Divestitures (Tables)
 6 Months Ended
Jun. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]  
Disposal Groups, Including Discontinued Operations [Table Text Block]
A summary of discontinued operations presented in the condensed consolidated statements of income includes the following:    
 
 
Three Months
 
Six Months
 
 
June 30,
 
June 30,
(in thousands)
 
2020
 
2019
 
2020
 
2019
Operating revenues(1)
 
$
3

 
$
41,280

 
$
23

 
$
118,302

Cost of sales(1)
 
10

 
40,539

 
1

 
115,701

Other operating expenses
 
39

 
1,470

 
197

 
3,460

Operating loss
 
(46
)
 
(729
)
 
(175
)

(859
)
Interest and other expense
 
(6
)
 
(101
)
 
(29
)
 
(166
)
Loss from Discontinued Operations before income taxes
 
(52
)
 
(830
)
 
(204
)

(1,025
)
Gain on sale of Discontinued Operations
 
200

 
—

 
200

 
 
Income tax benefit
 
(147
)
 
(220
)
 
(188
)
 
(268
)
Gain (Loss) from Discontinued Operations, Net of Tax
 
$
295

 
$
(610
)
 
$
184


$
(757
)
(1) Included in operating revenues and cost of sales for the three and six months ended June 30, 2019, is $4.9 million and $14.8 million, respectively, representing amounts which had been previously eliminated in consolidation related to intercompany activity that continued with the buyers after the disposition of the assets of PESCO.

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] The following table summarizes significant statements of cash flows data related to the discontinued operations of PESCO:
(in thousands)
 
Three Months Ended June 30, 2019
Six Months Ended June 30, 2019
Depreciation and amortization
 
$
146

$
291

Deferred income taxes
 
$
(1,021
)
$
375

Realized loss on commodity contracts
 
$
(97
)
$
(681
)