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Common Stock Common Stock (Notes)
 3 Months Ended
Mar. 31, 2019
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
COMMON STOCK
The Company has entered into four separate sales agency agreements under which the sales agents may offer and sell new shares of the Company’s common stock from time to time. No shares were issued under these agreements during the three months ended March 31, 2019. These agreements provide for the offering of a maximum of approximately 3.8 million shares, of which approximately 1.1 million remain unissued as of March 31, 2019. Subject to the satisfaction of customary conditions, the Company has the right to increase the maximum number of shares that may be offered under these agreements.
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):
 
March 31,
 
December 31,
 
2019
 
2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,048 and $2,091, respectively
$
7,706

 
$
7,866

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands).
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2019
 
2018
 
Affected Line Item in Statement of Income
Amortization of defined benefit pension items
 
 
 
 
 
Amortization of net prior service cost
 
$
(200
)
 
$
(228
)
 
(a)
Amortization of net loss
 
3,661

 
2,995

 
(a)
Adjustment due to effects of regulation
 
(3,258
)
 
(2,508
)
 
(a)
 
 
203

 
259

 
Total before tax
 
 
(43
)
 
(55
)
 
Tax expense
 
 
$
160

 
$
204

 
Net of tax
(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).