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Acquisitions and Divestitures Acquisitions and Divestitures (Tables)
 3 Months Ended
Mar. 31, 2020
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 Ended
 
 
March 31,
(in thousands)
 
2020
 
2019
Operating revenues(1)
 
$
—

 
$
77,022

Cost of sales(1)
 
(9
)
 
75,162

Other operating expenses
 
116

 
1,991

Operating loss
 
(107
)

(131
)
Interest and other expense
 
(24
)
 
(70
)
Loss from Discontinued Operations before income taxes
 
(131
)

(201
)
Income tax benefit
 
(35
)
 
(51
)
Loss from Discontinued Operations, Net of Tax
 
$
(96
)
 
$
(150
)

(1) Included in operating revenues and cost of sales for the three months ended March 31, 2019, is $9.9 million representing amounts which had been previously eliminated in consolidation related to intercompany activity that will continue with the buyers after the disposition of the assets of PESCO.
Discontinued Operations [Member]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
We have elected not to separately disclose discontinued operations on the condensed consolidated statements of cash flows. The following table summarizes significant statements of cash flows data related to the discontinued operations of PESCO:
(in thousands)
 
Three Months Ended
March 31, 2019
Depreciation and amortization
 
$
146

Deferred income taxes
 
$
1,396

Realized loss on commodity contracts
 
$
584