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Financial Instruments And Investments (Tables)
 12 Months Ended
Dec. 31, 2011
Financial Instruments And Investments [Abstract]  
Company's Decommissioning Trust Funds And Investments In Debt Securities
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,
 
2011
 
2010
 
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
Pollution Control Bonds
$
193,135

 
$
206,756

 
$
193,135

 
$
192,924

Senior Notes
546,662

 
700,371

 
546,610

 
574,700

RGRT Senior Notes (1)
110,000

 
116,985

 
110,000

 
110,371

RCF (1)
33,379

 
33,379

 
4,704

 
4,704

Total
$
883,176

 
$
1,057,491

 
$
854,449

 
$
882,699

 __________________
(1)
Nuclear fuel financing as of December 31, 2011 is funded through the $110.0 million RGRT Senior Notes and $13.4 million under the RCF and $20.0 million was outstanding under the RCF for working capital and 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.
Schedule of Available for Sale Securities Continuous Unrealized Loss Position
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, 2011
 
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
$
515

 
$
(8
)
 
$
1,233

 
$
(23
)
 
$
1,748

 
$
(31
)
U.S. Government Bonds
100

 
(1
)
 
2,413

 
(38
)
 
2,513

 
(39
)
Municipal Obligations
2,275

 
(31
)
 
4,731

 
(144
)
 
7,006

 
(175
)
Corporate Obligations
3,525

 
(118
)
 
1,234

 
(43
)
 
4,759

 
(161
)
Total Debt Securities
6,415

 
(158
)
 
9,611

 
(248
)
 
16,026

 
(406
)
Common Stock
10,688

 
(2,065
)
 
1,740

 
(489
)
 
12,428

 
(2,554
)
Total Temporarily Impaired Securities
$
17,103

 
$
(2,223
)
 
$
11,351

 
$
(737
)
 
$
28,454

 
$
(2,960
)
 ____________________
(1)
Includes approximately 96 securities.
 
December 31, 2010
 
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
$
2,290

 
$
(51
)
 
$
441

 
$
(27
)
 
$
2,731

 
$
(78
)
U.S. Government Bonds
9,583

 
(124
)
 
—

 
—

 
9,583

 
(124
)
Municipal Obligations
13,145

 
(278
)
 
3,763

 
(145
)
 
16,908

 
(423
)
Corporate Obligations
1,855

 
(18
)
 
—

 
—

 
1,855

 
(18
)
Total Debt Securities
26,873

 
(471
)
 
4,204

 
(172
)
 
31,077

 
(643
)
Common stock
6,943

 
(774
)
 
4,303

 
(420
)
 
11,246

 
(1,194
)
Total Temporarily Impaired Securities
$
33,816

 
$
(1,245
)
 
$
8,507

 
$
(592
)
 
$
42,323

 
$
(1,837
)
 ______________________
(2)
Includes approximately 96 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):
 
 
December 31, 2011
 
December 31, 2010
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
25,077

 
$
1,220

 
$
18,472

 
$
793

U.S. Government Bonds
10,263

 
972

 
10,450

 
183

Municipal Obligations
30,310

 
1,792

 
15,633

 
592

Corporate Obligations
7,641

 
459

 
7,223

 
362

Total Debt Securities
73,291

 
4,443

 
51,778

 
1,930

Common Stock
62,479

 
15,681

 
56,770

 
14,142

Cash and Cash Equivalents
3,739

 
—

 
3,007

 
—

Total
$
139,509

 
$
20,124

 
$
111,555

 
$
16,072
Contractual Year For Maturity Of Available-For-Sale Securities
The contractual year for maturity for these available-for-sale securities as of December 31, 2011 is as follows (in thousands): 
 
Total
 
2012
 
2013
through
2016
 
2017 through 2021
 
2022 and Beyond
Municipal Debt Obligations
$
37,316

 
$
1,009

 
$
12,892

 
$
14,252

 
$
9,163

Corporate Debt Obligations
12,400

 
1,368

 
3,630

 
4,338

 
3,064

U.S. Government Bonds
12,776

 
1,316

 
1,685

 
6,844

 
2,931
Unrealized Holding Losses Included In Pre-Tax Income
For the twelve months ended December 31, 2011, 2010, and 2009 the Company recognized other than temporary impairment losses on its available-for-sale securities as follows (in thousands): 
 
2011
 
2010
 
2009
Gross unrealized holding losses included in pre-tax income
$
(2,116
)
 
$
(263
)
 
$
(5,594
)
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, 2011, 2010, and 2009 and the related effects on pre-tax income are as follows (in thousands): 
 
2011
 
2010
 
2009
Proceeds from sales of available-for-sale securities
$
82,926

 
$
61,656

 
$
79,935

Gross realized gains included in pre-tax income
$
1,479

 
$
1,030

 
$
3,614

Gross realized losses included in pre-tax income
(721
)
 
(889
)
 
(238
)
Gross unrealized losses included in pre-tax income
(2,116
)
 
(263
)
 
(5,594
)
        Net losses in pre-tax income
$
(1,358
)
 
$
(122
)
 
$
(2,218
)
Net unrealized holding gains included in accumulated other comprehensive income
$
1,570

 
$
6,665

 
$
12,816

Net losses reclassified out of accumulated other comprehensive income
1,358

 
122

 
2,218

Net gains in other comprehensive income
$
2,928

 
$
6,787

 
$
15,034
Trading Securities (and Certain Trading Assets)
Below is a reconciliation of the beginning and ending balance of the fair value in investment in debt securities (in thousands): 
 
2011
 
2010
Balance at January 1
$
2,909

 
$
2,510

Sale of debt security
(2,000
)
 
—

Realized gain on sale of debt security (a)
431

 
—

Net unrealized gains (losses) in fair value recognized in income on debt securities still held (a)
(220
)
 
399

Balance at December 31
$
1,120

 
$
2,909

_____________________
(a) These amounts are reflected in the Company's consolidated statement of operations as investment and interest income.
Fair Value, Measurement Inputs, Disclosure
The fair value of the Company’s Retirement Plan assets at December 31, 2011 and 2010, and the level within the three levels of the fair value hierarchy defined by FASB guidance on fair value measurements are presented in the table below (in thousands):
Description of Securities
Fair Value as of
December 31,
2011
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Cash and Cash Equivalents
$
6,708

 
$
6,708

 
$
—

 
$
—

U.S. Treasury Securities
24,178

 
24,178

 
—

 
—

Guaranteed Investment Contract
608

 
—

 
608

 
—

Common Stock
70,893

 
70,893

 
—

 
—

Mutual Funds - Fixed Income
53,598

 
53,598

 
—

 
—

Mutual Funds - Equity
26,873

 
26,873

 
—

 
—

Limited Partnership Interest in Real Estate (a)
8,511

 
—

 
—

 
8,511

Total Plan Investments
$
191,369

 
$
182,250

 
$
608

 
$
8,511


Description of Securities
Fair Value as of
December 31,
2010
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Cash and Cash Equivalents
$
4,975

 
$
4,975

 
$
—

 
$
—

U.S. Treasury Securities
83,601

 
83,601

 
—

 
—

Guaranteed Investment Contract
550

 
—

 
550

 
—

Common Stock
54,957

 
54,957

 
—

 
—

Mutual Funds
19,501

 
19,501

 
—

 
—

Limited Partnership Interest in Real Estate (a)
7,757

 
—

 
—

 
7,757

Total Plan Investments
$
171,341

 
$
163,034

 
$
550

 
$
7,757

 _____________________
(a)
This investment is a commercial real estate partnership that purchases land, develops limited infrastructure, and sells it for commercial development. The Company is restricted from selling its partnership interest during the life of the partnership which is generally 5-7 years. Return of investment is realized as land is sold. The fair value of the limited partnership interest in real estate is based on the net asset value of the partnership which reflects the appraised value of the land.
The fair value of the Company’s decommissioning trust funds and investments in debt securities, at December 31, 2011 and 2010, 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
December 31,
2011
 
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
 
$
1,120

 
$
—

 
$
—

 
$
1,120

Available for sale:
 
 
 
 
 
 
 
 
U.S. Government Bonds
 
$
12,776

 
$
12,776

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
 
26,825

 
—

 
26,825

 
—

Municipal Bonds
 
37,316

 
—

 
37,316

 
—

Corporate Asset Backed Obligations
 
12,400

 
—

 
12,400

 
—

Subtotal, Debt Securities
 
89,317

 
12,776

 
76,541

 
—

Common Stock
 
74,907

 
74,907

 
—

 
—

Cash and Cash Equivalents
 
3,739

 
3,739

 
—

 
—

Total available for sale
 
$
167,963

 
$
91,422

 
$
76,541

 
$
—

 
Description of Securities
Fair Value as  of
December 31,
2010
 
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
$
2,909

 
$
—

 
$
—

 
$
2,909

Available for sale:
 
 
 
 
 
 
 
U.S. Government Bonds
$
20,033

 
$
20,033

 
$
—

 
$
—

Federal Agency Mortgage Backed Securities
21,204

 
—

 
21,204

 
—

Municipal Bonds
32,541

 
—

 
32,541

 
—

Corporate Asset Backed Obligations
9,077

 
—

 
9,077

 
—

Subtotal, Debt Securities
82,855

 
20,033

 
62,822

 
—

Common Stock
68,016

 
68,016

 
—

 
—

Cash and Cash Equivalents
3,007

 
3,007

 
—

 
—

Total available for sale
$
153,878

 
$
91,056

 
$
62,822

 
$
—