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Financial Instruments And Investments (Tables)
 9 Months Ended
Sep. 30, 2013
Financial Instruments And Investments [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, 2013
 
December 31, 2012
 
Carrying
Amount
 
Estimated
Fair
Value
 
Carrying
Amount
 
Estimated
Fair
Value
Pollution Control Bonds
$
193,135

 
$
195,519

 
$
193,135

 
$
215,228

Senior Notes
696,463

 
758,150

 
696,400

 
823,497

RGRT Senior Notes (1)
110,000

 
116,955

 
110,000

 
120,985

RCF (1)
15,491

 
15,491

 
22,155

 
22,155

Total
$
1,015,089

 
$
1,086,115

 
$
1,021,690

 
$
1,181,865

_______________ 
(1)
Nuclear fuel financing as of September 30, 2013 and December 31, 2012 is funded through the $110 million RGRT Senior Notes and $15.5 million and $22.2 million, respectively under the RCF. As of September 30, 2013 and December 31, 2012, no 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 quarter reflecting current market rates. Consequently, the carrying value approximates fair value.
Marketable Securities Fair Value And Unrealized Losses
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, 2013
 
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
$
1,909

 
$
(100
)
 
$
729

 
$
(50
)
 
$
2,638

 
$
(150
)
U.S. Government Bonds
10,664

 
(477
)
 
7,086

 
(344
)
 
17,750

 
(821
)
Municipal Obligations
15,360

 
(455
)
 
5,316

 
(328
)
 
20,676

 
(783
)
Corporate Obligations
3,264

 
(127
)
 
400

 
(5
)
 
3,664

 
(132
)
Total Debt Securities
31,197

 
(1,159
)
 
13,531

 
(727
)
 
44,728

 
(1,886
)
Common Stock
1,007

 
(96
)
 
217

 
(18
)
 
1,224

 
(114
)
Total Temporarily Impaired Securities
$
32,204

 
$
(1,255
)
 
$
13,748

 
$
(745
)
 
$
45,952

 
$
(2,000
)
 
_________________
(1)
Includes approximately 112 securities.
 
December 31, 2012
 
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
$
1,792

 
$
(5
)
 
$
416

 
$
(9
)
 
$
2,208

 
$
(14
)
U.S. Government Bonds
6,633

 
(79
)
 
4,457

 
(114
)
 
11,090

 
(193
)
Municipal Obligations
5,306

 
(39
)
 
5,760

 
(241
)
 
11,066

 
(280
)
Corporate Obligations
452

 
(11
)
 
—

 
—

 
452

 
(11
)
Total Debt Securities
14,183

 
(134
)
 
10,633

 
(364
)
 
24,816

 
(498
)
Common Stock
3,603

 
(409
)
 
—

 
—

 
3,603

 
(409
)
Total Temporarily Impaired Securities
$
17,786

 
$
(543
)
 
$
10,633

 
$
(364
)
 
$
28,419

 
$
(907
)
 
_________________
(2)
Includes approximately 65 securities.
Unrecognized Gross Unrealized Gains And the Fair Value
The table below presents the unrecognized gross unrealized gains and the fair value of these securities, aggregated by investment category (in thousands): 
 
September 30, 2013
 
December 31, 2012
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
13,753

 
$
531

 
$
17,289

 
$
1,036

U.S. Government Bonds
7,023

 
251

 
13,295

 
678

Municipal Obligations
14,296

 
728

 
22,797

 
1,531

Corporate Obligations
10,081

 
501

 
12,378

 
1,134

Total Debt Securities
45,153

 
2,011

 
65,759

 
4,379

Common Stock
89,534

 
34,116

 
73,210

 
22,839

Equity Mutual Funds
16,207

 
2,582

 
15,194

 
1,821

Cash and Cash Equivalents
6,061

 
—

 
4,471

 
—

Total
$
156,955

 
$
38,709

 
$
158,634

 
$
29,039
Contractual Year For Maturity Of Available-For-Sale Securities
The contractual year for maturity of these available-for-sale securities as of September 30, 2013 is as follows (in thousands): 
 
Total
 
2013
 
2014
through
2017
 
2018 through 2022
 
2023 and Beyond
Municipal Debt Obligations
$
34,972

 
$
555

 
$
12,200

 
$
17,498

 
$
4,719

Corporate Debt Obligations
13,745

 
—

 
4,144

 
5,533

 
4,068

U.S. Government Bonds
24,773

 
804

 
9,638

 
11,574

 
2,757
Unrealized Holding Losses Included In Pre-Tax Income
For the three, nine and twelve months ended September 30, 2013 and 2012, the Company recognized other than temporary impairment losses on its available-for-sale securities as follows (in thousands): 
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Unrealized losses included in pre-tax income
$
—

 
$
—

 
$
—

 
$
(166
)
 
$
(313
)
 
$
(536
)
Sale of Securities And The Related Effects On Pre-Tax Income
The proceeds from the sale of these securities 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,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Proceeds from sales of available-for-sale securities
$
7,057

 
$
14,582

 
$
29,419

 
$
74,095

 
$
53,866

 
$
89,180

Gross realized gains included in pre-tax income
$
212

 
$
447

 
$
593

 
$
1,526

 
$
814

 
$
1,757

Gross realized losses included in pre-tax income
(13
)
 
(129
)
 
(306
)
 
(2,276
)
 
(340
)
 
(2,414
)
Unrealized losses included in pre-tax income
—

 
—

 
—

 
(166
)
 
(313
)
 
(536
)
Net gains (losses) in pre-tax income
$
199

 
$
318

 
$
287

 
$
(916
)
 
$
161

 
$
(1,193
)
Net unrealized holding gains included in accumulated other comprehensive income
$
4,300

 
$
6,169

 
$
8,861

 
$
11,986

 
$
6,802

 
$
18,470

Net (gains) losses reclassified out of accumulated other comprehensive income
(199
)
 
(318
)
 
(287
)
 
916

 
(161
)
 
1,193

Net gains in other comprehensive income
$
4,101

 
$
5,851

 
$
8,574

 
$
12,902

 
$
6,641

 
$
19,663
Fair Value, Measurement Inputs, Disclosure
The fair value of the Company’s decommissioning trust funds and investment in debt securities, at September 30, 2013 and December 31, 2012, and the level within the three levels of the fair value hierarchy defined by FASB guidance are presented in the table below (in thousands): 
Description of Securities
Fair Value as of September 30, 2013
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Trading Securities:
 
 
 
 
 
 
 
Investment in Debt Securities
$
1,493

 
$
—

 
$
—

 
$
1,493

Available for sale:
 
 
 
 
 
 
 
U.S. Government Bonds
$
24,773

 
$
24,773

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
16,391

 
—

 
16,391

 
—

Municipal Bonds
34,972

 
—

 
34,972

 
—

Corporate Asset Backed Obligations
13,745

 
—

 
13,745

 
—

Subtotal Debt Securities
89,881

 
24,773

 
65,108

 
—

Common Stock
90,758

 
90,758

 
—

 
—

Equity Mutual Funds
16,207

 
16,207

 
—

 
—

Cash and Cash Equivalents
6,061

 
6,061

 
—

 
—

Total available for sale
$
202,907

 
$
137,799

 
$
65,108

 
$
—

Description of Securities
Fair Value as of December 31, 2012
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Trading Securities:
 
 
 
 
 
 
 
Investment in Debt Securities
$
1,295

 
$
—

 
$
—

 
$
1,295

Available for sale:
 
 
 
 
 
 
 
U.S. Government Bonds
$
24,385

 
$
24,385

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
19,497

 
—

 
19,497

 
—

Municipal Bonds
33,863

 
—

 
33,863

 
—

Corporate Asset Backed Obligations
12,830

 
—

 
12,830

 
—

Subtotal Debt Securities
90,575

 
24,385

 
66,190

 
—

Common Stock
76,813

 
76,813

 
—

 
—

Equity Mutual Funds
15,194

 
15,194

 
—

 
—

Cash and Cash Equivalents
4,471

 
4,471

 
—

 
—

Total available for sale
$
187,053

 
$
120,863

 
$
66,190

 
$
—