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Financial Instruments And Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Unrealized Gains and losses recognized [Line Items]  
Fair Values Of Long-Term Debt And Short-Term Borrowings Under the RCF The fair values of the Company's long-term debt and short-term borrowings under the RCF are based on estimated market prices for similar issues and are presented below (in thousands): 
 
June 30, 2019
 
December 31, 2018
 
Carrying
Amount
 
Estimated
Fair
Value
 
Carrying
Amount
 
Estimated
Fair
Value
Pollution Control Bonds (1)
$
158,214

 
$
162,471

 
$
157,769

 
$
161,917

Senior Notes
1,118,140

 
1,322,280

 
1,117,943

 
1,244,310

RGRT Senior Notes (2)
109,563

 
114,390

 
109,507

 
111,440

RCF (2)
160,773

 
160,773

 
49,207

 
49,207

Total
$
1,546,690

 
$
1,759,914

 
$
1,434,426

 
$
1,566,874

_______________ 
(1)
On February 1, 2019 and April 1, 2019, the Company purchased in lieu of redemption the 2009 Series A 7.25% PCBs with an aggregate principal amount of $63.5 million and the 2009 Series B 7.25% PCBs with an aggregate principal amount of $37.1 million, respectively, utilizing funds borrowed under the RCF. On May 22, 2019, the Company reoffered and sold $63.5 million aggregate principal amount of 2009 Series A 7.25% PCBs and $37.1 million aggregate principal amount of 2009 Series B 7.25% PCBs with a fixed interest rate of 3.60% per annum until the bonds mature on February 1, 2040 and April 1, 2040, respectively. See Part I, Item 1, Financial Statements, Note M of Notes to Financial Statements for further discussion.
(2)
Nuclear fuel financing, as of June 30, 2019 and December 31, 2018, is funded through $110 million RGRT Senior Notes and $27.3 million and $26.2 million, respectively, under the RCF. As of June 30, 2019, $133.5 million was outstanding under the RCF for working capital and general corporate purposes. As of December 31, 2018, $23.0 million, was outstanding under the RCF for working capital or general corporate purposes. The interest rate on the Company's borrowings under the RCF is reset throughout the quarter reflecting current market rates. Consequently, the carrying value approximates fair value.
Unrecognized Gross Unrealized Gains (Losses) And the Fair Value The tables below present the gross unrealized losses and the fair value of these securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands): 
 
June 30, 2019
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
  Unrealized Losses
Description of Securities (1):
 
 
 
 
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
1,021

 
$
(20
)
 
$
6,654

 
$
(96
)
 
$
7,675

 
$
(116
)
U.S. Government Bonds
—

 
—

 
19,763

 
(867
)
 
19,763

 
(867
)
Municipal Debt Obligations
4,800

 
(315
)
 
751

 
(70
)
 
5,551

 
(385
)
Corporate Debt Obligations
777

 
(2
)
 
4,706

 
(154
)
 
5,483

 
(156
)
Total
$
6,598

 
$
(337
)
 
$
31,874

 
$
(1,187
)
 
$
38,472

 
$
(1,524
)
 
_________________
(1)
Includes 67 securities.
 
December 31, 2018
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Description of Securities (2):
 
 
 
 
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
6,187

 
$
(36
)
 
$
14,567

 
$
(510
)
 
$
20,754

 
$
(546
)
U.S. Government Bonds
4,005

 
(9
)
 
36,615

 
(1,663
)
 
40,620

 
(1,672
)
Municipal Debt Obligations
3,100

 
(74
)
 
9,037

 
(723
)
 
12,137

 
(797
)
Corporate Debt Obligations
22,259

 
(763
)
 
11,231

 
(731
)
 
33,490

 
(1,494
)
Total
$
35,551

 
$
(882
)
 
$
71,450

 
$
(3,627
)
 
$
107,001

 
$
(4,509
)
 
_________________
(2)
Includes 156 securities.
Marketable Securities Fair Value and Unrecognized Gross Unrealized Gain The table below presents the unrecognized gross unrealized gains and the fair value of these securities, aggregated by investment category (in thousands): 
 
June 30, 2019
 
December 31, 2018
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
21,809

 
$
466

 
$
9,959

 
$
176

U.S. Government Bonds
32,620

 
1,071

 
6,987

 
149

Municipal Debt Obligations
4,476

 
341

 
1,952

 
120

Corporate Debt Obligations
41,866

 
2,052

 
8,283

 
222

Total Debt Securities
$
100,771

 
$
3,930

 
$
27,181

 
$
667
Sale of Securities And The Related Effects On Pre-Tax Income The proceeds from the sale of these securities during the three, six and twelve months ended June 30, 2019 and 2018, and the related effects on pre-tax income are as follows (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
Twelve Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Proceeds from sales or maturities of available-for-sale securities
$
7,116

 
$
2,608

 
$
22,887

 
$
14,365

 
$
34,477

 
$
48,871

Gross realized gains included in pre-tax income
$
55

 
$
—

 
$
113

 
$
9

 
$
121

 
$
3,873

Gross realized losses included in pre-tax income
(196
)
 
(147
)
 
(1,083
)
 
(674
)
 
(1,871
)
 
(1,269
)
Net gains (losses) included in pre-tax income
$
(141
)
 
$
(147
)
 
$
(970
)
 
$
(665
)
 
$
(1,750
)
 
$
2,604
Fair Value, Measurement Inputs, Disclosure
The fair value of the NDT and investments in debt securities at June 30, 2019 and December 31, 2018, and the level within the three levels of the fair value hierarchy defined by the FASB guidance are presented in the table below (in thousands): 
Description of Securities
Fair Value as of June 30, 2019
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Trading Securities:
 
 
 
 
 
 
 
Investments in Debt Securities
$
1,622

 
$
—

 
$
—

 
$
1,622

Equity Securities:
 
 
 
 
 
 
 
Domestic
$
132,183

 
$
132,183

 
$
—

 
$
—

International
27,462

 
27,462

 
—

 
—

Total Equity Securities
159,645

 
159,645

 
—

 
—

Available for Sale Debt Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
29,484

 
—

 
29,484

 
—

U.S. Government Bonds
52,383

 
52,383

 
—

 
—

Municipal Debt Obligations
10,027

 
—

 
10,027

 
—

Corporate Debt Obligations
47,349

 
—

 
47,349

 
—

Total Available for Sale Debt Securities
139,243

 
52,383

 
86,860

 
—

Cash and Cash Equivalents
9,176

 
9,176

 
—

 
—

Total
$
308,064

 
$
221,204

 
$
86,860

 
$
—

Description of Securities
Fair Value as of December 31, 2018
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Trading Securities:
 
 
 
 
 
 
 
Investments in Debt Securities
$
1,656

 
$
—

 
$
—

 
$
1,656

Equity Securities:
 
 
 
 
 
 
 
Domestic
$
111,325

 
$
111,325

 
$
—

 
$
—

International
24,540

 
24,540

 
—

 
—

Total Equity Securities
135,865

 
135,865

 
—

 
—

Available for Sale Debt Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
30,713

 
—

 
30,713

 
—

U.S. Government Bonds
47,607

 
47,607

 
—

 
—

Municipal Debt Obligations
14,089

 
—

 
14,089

 
—

Corporate Debt Obligations
41,773

 
—

 
41,773

 
—

Total Available for Sale Debt Securities
134,182

 
47,607

 
86,575

 
—

Cash and Cash Equivalents
6,858

 
6,858

 
—

 
—

Total
$
276,905

 
$
190,330

 
$
86,575

 
$
—
Available-for-sale Securities  
Unrealized Gains and losses recognized [Line Items]  
Contractual Year For Maturity Of Available-For-Sale Securities The contractual year of maturity for these available-for-sale debt securities as of June 30, 2019, is as follows (in thousands): 
 
Total
 
2019
 
2020
through
2023
 
2024 through 2028
 
2029 and Beyond
Federal Agency Mortgage Backed Securities
$
29,484

 
$
—

 
$
11

 
$
483

 
$
28,990

U.S. Government Bonds
52,383

 
2,355

 
22,697

 
21,866

 
5,465

Municipal Debt Obligations
10,027

 
378

 
3,725

 
3,472

 
2,452

Corporate Debt Obligations
47,349

 
—

 
19,676

 
14,243

 
13,430

Total Available for Sale Debt Securities
$
139,243

 
$
2,733

 
$
46,109

 
$
40,064

 
$
50,337
Equity Securities  
Unrealized Gains and losses recognized [Line Items]  
Unrealized Gain (Loss) on Investments The unrealized gains and losses recognized during the three and six months ended June 30, 2019 and 2018, and related effects on pre-tax income are as follows (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
Net gains recognized on equity securities
$
5,367

 
$
3,249

 
$
22,185

 
$
1,258

Less: Net gains recognized on equity securities sold
158

 
2,266

 
286

 
4,056

Unrealized gains and (losses) recognized on equity securities still held at reporting date
$
5,209

 
$
983

 
$
21,899

 
$
(2,798
)