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Financial Instruments And Investments (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Values Of Long-Term Debt And Short-Term Borrowings Under the RCF
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): 
 
September 30, 2016
 
December 31, 2015
 
Carrying
Amount (1)
 
Estimated
Fair
Value
 
Carrying
Amount (1)
 
Estimated
Fair
Value
Pollution Control Bonds
$
190,706

 
$
211,050

 
$
190,499

 
$
212,624

Senior Notes
993,004

 
1,207,162

 
837,475

 
829,864

RGRT Senior Notes (2)
94,768

 
100,465

 
94,686

 
100,345

RCF (2)
55,192

 
55,192

 
141,738

 
141,738

Total
$
1,333,670

 
$
1,573,869

 
$
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 September 30, 2016 and December 31, 2015, is funded through the $95 million RGRT Senior Notes and $36.2 million and $33.7 million, respectively under the RCF. As of September 30, 2016, $19.0 million was outstanding under the RCF for working capital or general corporate purposes. As of December 31, 2015, $108.0 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): 
 
September 30, 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
$
1,028

 
$
(9
)
 
$
—

 
$
—

 
$
1,028

 
$
(9
)
U.S. Government Bonds
8,728

 
(151
)
 
12,300

 
(526
)
 
21,028

 
(677
)
Municipal Obligations
4,692

 
(43
)
 
8,171

 
(515
)
 
12,863

 
(558
)
Corporate Obligations
3,380

 
(50
)
 
2,381

 
(138
)
 
5,761

 
(188
)
Total Debt Securities
17,828

 
(253
)
 
22,852

 
(1,179
)
 
40,680

 
(1,432
)
Common Stock
1,393

 
(124
)
 
—

 
—

 
1,393

 
(124
)
Institutional Equity Funds-International Equity
22,847

 
(249
)
 
—

 
—

 
22,847

 
(249
)
Total Temporarily Impaired Securities
$
42,068

 
$
(626
)
 
$
22,852

 
$
(1,179
)
 
$
64,920

 
$
(1,805
)
 
_________________
(1)
Includes 104 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 Equity 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 133 securities.
Unrealized Holding Losses Included In Pre-Tax Income
For the three, nine and twelve months ended September 30, 2016 and 2015, the Company recognized other than temporary impairment losses on its available-for-sale securities as follow (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Unrealized holding losses included in pre-tax income
$
(196
)
 
$
—

 
$
(352
)
 
$
—

 
$
(690
)
 
$
—
Available-For-Sale-Securities, Continuous Unrealized Gain Position
The table below presents the unrecognized gross unrealized gains and the fair value of these securities, aggregated by investment category (in thousands): 
 
September 30, 2016
 
December 31, 2015
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
16,772

 
$
701

 
$
9,589

 
$
438

U.S. Government Bonds
35,711

 
1,285

 
12,033

 
136

Municipal Obligations
9,273

 
398

 
8,671

 
332

Corporate Obligations
18,368

 
1,347

 
10,110

 
368

Total Debt Securities
80,124

 
3,731

 
40,403

 
1,274

Common Stock
66,055

 
34,418

 
72,636

 
37,001

Equity Mutual Funds
35,552

 
1,995

 
18,853

 
91

Cash and Cash Equivalents
7,975

 
—

 
8,204

 
—

Total
$
189,706

 
$
40,144

 
$
140,096

 
$
38,366
Contractual Year For Maturity Of Available-For-Sale Securities
The contractual year for maturity of these available-for-sale securities as of September 30, 2016 is as follows (in thousands): 
 
Total
 
2016
 
2017
through
2020
 
2021 through 2025
 
2026 and Beyond
Municipal Debt Obligations
$
22,136

 
$
417

 
$
7,909

 
$
12,730

 
$
1,080

Corporate Debt Obligations
24,129

 
—

 
5,501

 
9,941

 
8,687

U.S. Government Bonds
56,739

 
—

 
29,297

 
14,542

 
12,900
Sale of Securities And The Related Effects On Pre-Tax Income
The proceeds from the sale of these securities during the three, nine, and twelve months ended September 30, 2016 and 2015 and the related effects on pre-tax income are as follows (in thousands): 
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Proceeds from sales or maturities of available-for-sale securities
$
19,453

 
$
26,618

 
$
60,165

 
$
63,776

 
$
98,956

 
$
124,732

Gross realized gains included in pre-tax income
$
2,446

 
$
4,515

 
$
6,687

 
$
8,330

 
$
10,736

 
$
12,467

Gross realized losses included in pre-tax income
(178
)
 
(191
)
 
(765
)
 
(443
)
 
(1,249
)
 
(1,021
)
Gross unrealized losses included in pre-tax income
(196
)
 
—

 
(352
)
 
—

 
(690
)
 
—

Net gains included in pre-tax income
$
2,072

 
$
4,324

 
$
5,570

 
$
7,887

 
$
8,797

 
$
11,446

Net unrealized holding gains (losses) included in accumulated other comprehensive income
$
4,313

 
$
(8,092
)
 
$
9,293

 
$
(8,641
)
 
$
15,028

 
$
(5,779
)
Net gains reclassified from accumulated other comprehensive income
(2,072
)
 
(4,324
)
 
(5,570
)
 
(7,887
)
 
(8,797
)
 
(11,446
)
Net gains (losses) in other comprehensive
income
$
2,241

 
$
(12,416
)
 
$
3,723

 
$
(16,528
)
 
$
6,231

 
$
(17,225
)
Fair Value, Measurement Inputs, Disclosure
The fair value of the Company's decommissioning trust funds and investments in debt securities at September 30, 2016 and December 31, 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 September 30, 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
$
1,398

 
$
—

 
$
—

 
$
1,398

Available for sale:
 
 
 
 
 
 
 
U.S. Government Bonds
$
56,739

 
$
56,739

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
17,800

 
—

 
17,800

 
—

Municipal Bonds
22,136

 
—

 
22,136

 
—

Corporate Asset Backed Obligations
24,129

 
—

 
24,129

 
—

Subtotal Debt Securities
120,804

 
56,739

 
64,065

 
—

Common Stock
67,448

 
67,448

 
—

 
—

Equity Mutual Funds
35,552

 
35,552

 
—

 
—

Institutional Funds-International Equity
22,847

 
22,847

 
—

 
—

Cash and Cash Equivalents
7,975

 
7,975

 
—

 
—

Total Available for Sale
$
254,626

 
$
190,561

 
$
64,065

 
$
—

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 Bonds
24,345

 
—

 
24,345

 
—

Corporate Asset Backed 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

 
$
—