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Financial Instruments And Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
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):
 
December 31,
 
2016
 
2015
 
Carrying
Amount (1)
 
Estimated
Fair Value
 
Carrying
Amount (1)
 
Estimated
Fair Value
Pollution Control Bonds
$
190,775

 
$
206,818

 
$
190,499

 
$
212,624

Senior Notes
993,086

 
1,112,285

 
837,475

 
829,864

RGRT Senior Notes (2)
94,795

 
98,855

 
94,686

 
100,345

RCF (2)
81,574

 
81,574

 
141,738

 
141,738

Total
$
1,360,230

 
$
1,499,532

 
$
1,264,398

 
$
1,284,571

 __________________
(1)
The Company implemented ASU 2015-03, Interest - Imputation of Interest, which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. ASU 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The impact of ASU 2015-03 on the Company's Balance Sheet was to reclassify $11.6 million of other deferred charges to long-term debt, net of current portion at December 31, 2015.
(2)
Nuclear fuel financing, as of December 31, 2016 and December 31, 2015, is funded through the $95 million RGRT Senior Notes and $37.6 million and $33.7 million, respectively under the RCF. As of December 31, 2016, $44.0 million was outstanding under the RCF for working capital or general corporate purposes. As of December 31, 2015, $108.0 million amount 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 period 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):

 
December 31, 2016
 
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
$
11,582

 
$
(239
)
 
$
436

 
$
(22
)
 
$
12,018

 
$
(261
)
U.S. Government Bonds
31,655

 
(762
)
 
17,976

 
(835
)
 
49,631

 
(1,597
)
Municipal Obligations
9,596

 
(394
)
 
4,067

 
(372
)
 
13,663

 
(766
)
Corporate Obligations
7,971

 
(172
)
 
2,092

 
(172
)
 
10,063

 
(344
)
Total Debt Securities
60,804

 
(1,567
)
 
24,571

 
(1,401
)
 
85,375

 
(2,968
)
Common Stock
2,760

 
(167
)
 
—

 
—

 
2,760

 
(167
)
Institutional Funds-International Equity
22,945

 
(110
)
 
—

 
—

 
22,945

 
(110
)
Total Temporarily Impaired Securities
$
86,509

 
$
(1,844
)
 
$
24,571

 
$
(1,401
)
 
$
111,080

 
$
(3,245
)
 ____________________
(1)
Includes approximately 152 securities.
 
December 31, 2015
 
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
$
9,383

 
$
(97
)
 
$
1,113

 
$
(47
)
 
$
10,496

 
$
(144
)
U.S. Government Bonds
24,094

 
(310
)
 
14,272

 
(623
)
 
38,366

 
(933
)
Municipal Obligations
8,286

 
(160
)
 
7,388

 
(446
)
 
15,674

 
(606
)
Corporate Obligations
6,058

 
(722
)
 
2,307

 
(228
)
 
8,365

 
(950
)
Total Debt Securities
47,821

 
(1,289
)
 
25,080

 
(1,344
)
 
72,901

 
(2,633
)
Common Stock
3,584

 
(344
)
 
—

 
—

 
3,584

 
(344
)
Institutional Funds-International Equity
22,454

 
(768
)
 
—

 
—

 
22,454

 
(768
)
Total Temporarily Impaired Securities
$
73,859

 
$
(2,401
)
 
$
25,080

 
$
(1,344
)
 
$
98,939

 
$
(3,745
)
 ______________________
(2)
Includes approximately 133 securities.
Unrealized Holding Losses Included In Pre-Tax Income
For the twelve months ended December 31, 2016, 2015, and 2014, the Company recognized other than temporary impairment losses on its available-for-sale securities as follows (in thousands): 
 
2016
 
2015
 
2014
Unrealized holding losses included in pre-tax income
$
(352
)
 
$
(338
)
 
$
—
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):
 
 
December 31, 2016
 
December 31, 2015
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
7,430

 
$
319

 
$
9,589

 
$
438

U.S. Government Bonds
12,237

 
138

 
12,033

 
136

Municipal Obligations
2,481

 
144

 
8,671

 
332

Corporate Obligations
12,350

 
655

 
10,110

 
368

Total Debt Securities
34,498

 
1,256

 
40,403

 
1,274

Common Stock
61,884

 
34,066

 
72,636

 
37,001

Equity Mutual Funds
42,244

 
3,345

 
18,853

 
91

Cash and Cash Equivalents
6,002

 
—

 
8,204

 
—

Total
$
144,628

 
$
38,667

 
$
140,096

 
$
38,366
Contractual Year For Maturity Of Available-For-Sale Securities
The contractual year for maturity for these available-for-sale securities as of December 31, 2016 is as follows (in thousands): 
 
Total
 
2017
 
2018 through
2021
 
2022 through 2026
 
2027 and Beyond
Municipal Debt Obligations
$
16,144

 
$
990

 
$
6,253

 
$
8,139

 
$
762

Corporate Debt Obligations
22,413

 
—

 
8,664

 
6,090

 
7,659

U.S. Government Bonds
61,868

 
14,272

 
22,495

 
14,786

 
10,315

Federal Agency Mortgage Backed Securities
19,448

 
—

 
5

 
390

 
19,053
Sale of Securities And The Related Effects On Pre-Tax Income
The proceeds from the sale of these securities during the twelve months ended December 31, 2016, 2015, and 2014 and the related effects on pre-tax income are as follows (in thousands): 
 
2016
 
2015
 
2014
Proceeds from sales of available-for-sale securities
$
91,268

 
$
102,567

 
$
108,311

Gross realized gains included in pre-tax income
$
9,212

 
$
12,379

 
$
7,858

Gross realized losses included in pre-tax income
(1,220
)
 
(927
)
 
(508
)
Gross unrealized losses included in pre-tax income
(352
)
 
(338
)
 
—

        Net gains in pre-tax income
$
7,640

 
$
11,114

 
$
7,350

Net unrealized holding gains (losses) included in accumulated other comprehensive income
$
8,444

 
$
(2,906
)
 
$
10,827

Net (gains) losses reclassified out of accumulated other comprehensive income
(7,640
)
 
(11,114
)
 
(7,350
)
        Net gains (losses) in other comprehensive income
$
804

 
$
(14,020
)
 
$
3,477
Fair Value, Measurement Inputs, Disclosure
The fair value of the Company’s decommissioning trust funds and investments in debt securities at December 31, 2016 and 2015, 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
December 31,
2016
 
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
 
$
1,421

 
$
—

 
$
—

 
$
1,421

Available for sale:
 
 
 
 
 
 
 
 
U.S. Government Bonds
 
$
61,868

 
$
61,868

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
 
19,448

 
—

 
19,448

 
—

Municipal Obligations
 
16,144

 
—

 
16,144

 
—

Corporate Obligations
 
22,413

 
—

 
22,413

 
—

Subtotal, Debt Securities
 
119,873

 
61,868

 
58,005

 
—

Common Stock
 
64,644

 
64,644

 
—

 
—

Equity Mutual Funds
 
42,244

 
42,244

 
—

 
—

Institutional Funds-International Equity
 
22,945

 
22,945

 
—

 
—

Cash and Cash Equivalents
 
6,002

 
6,002

 
—

 
—

Total available for sale
 
$
255,708

 
$
197,703

 
$
58,005

 
$
—

 
Description of Securities
Fair Value as  of
December 31,
2015
 
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
$
1,543

 
$
—

 
$
—

 
$
1,543

Available for sale:
 
 
 
 
 
 
 
U.S. Government Bonds
$
50,399

 
$
50,399

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
20,085

 
—

 
20,085

 
—

Municipal Obligations
24,345

 
—

 
24,345

 
—

Corporate Obligations
18,475

 
—

 
18,475

 
—

Subtotal, Debt Securities
113,304

 
50,399

 
62,905

 
—

Common Stock
76,220

 
76,220

 
—

 
—

Equity Mutual Funds
18,853

 
18,853

 
—

 
—

Institutional Funds-International Equity
22,454

 
22,454

 
—

 
—

Cash and Cash Equivalents
8,204

 
8,204

 
—

 
—

Total available for sale
$
239,035

 
$
176,130

 
$
62,905

 
$
—
Trading Securities (and Certain Trading Assets)
Below is a reconciliation of the beginning and ending balance of the fair value of the investment in debt securities (in thousands): 
 
2016
 
2015
Balance at January 1
$
1,543

 
$
1,653

Net unrealized gains (losses) in fair value recognized in income (a)
(122
)
 
(110
)
Balance at December 31
$
1,421

 
$
1,543

_____________________
(a) These amounts are reflected in the Company's statements of operations as investment and interest income.