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Financial Instruments And Investments (Tables)
 6 Months Ended
Jun. 30, 2017
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): 
 
June 30, 2017
 
December 31, 2016
 
Carrying
Amount
 
Estimated
Fair
Value
 
Carrying
Amount
 
Estimated
Fair
Value
Pollution Control Bonds
$
190,913

 
$
204,498

 
$
190,775

 
$
206,818

Senior Notes
993,254

 
1,173,767

 
993,086

 
1,112,285

RGRT Senior Notes (1)
94,849

 
98,075

 
94,795

 
98,855

RCF (1)
178,884

 
178,884

 
81,574

 
81,574

Total
$
1,457,900

 
$
1,655,224

 
$
1,360,230

 
$
1,499,532

_______________ 
(1)
Nuclear fuel financing, as of June 30, 2017 and December 31, 2016, is funded through the $95 million Rio Grande Resources Trust ("RGRT") Senior Notes and $38.9 million and $37.6 million, respectively under the RCF. As of June 30, 2017, $140.0 million was outstanding under the RCF for working capital or general corporate purposes. As of December 31, 2016, $44.0 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, 2017
 
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
$
15,446

 
$
(188
)
 
$
415

 
$
(19
)
 
$
15,861

 
$
(207
)
U.S. Government Bonds
35,388

 
(598
)
 
9,816

 
(630
)
 
45,204

 
(1,228
)
Municipal Debt Obligations
6,903

 
(165
)
 
5,928

 
(482
)
 
12,831

 
(647
)
Corporate Debt Obligations
7,308

 
(79
)
 
2,944

 
(235
)
 
10,252

 
(314
)
Total Debt Securities
65,045

 
(1,030
)
 
19,103

 
(1,366
)
 
84,148

 
(2,396
)
Common Stock
718

 
(65
)
 
—

 
—

 
718

 
(65
)
Total Temporarily Impaired Securities
$
65,763

 
$
(1,095
)
 
$
19,103

 
$
(1,366
)
 
$
84,866

 
$
(2,461
)
 
_________________
(1)
Includes 136 securities.
 
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 (2):
 
 
 
 
 
 
 
 
 
 
 
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 Debt Obligations
9,596

 
(394
)
 
4,067

 
(372
)
 
13,663

 
(766
)
Corporate Debt 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 Equity 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
)
 
_________________
(2)
Includes 152 securities.
Unrealized Holding Losses Included In Pre-Tax Income
For the three, six and twelve months ended June 30, 2017 and 2016, the Company recognized other than temporary impairment losses on its available-for-sale securities as follow (in thousands):
 
Three Months Ended
 
Six Months Ended
 
Twelve Months Ended
 
June 30,
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Unrealized holding losses included in pre-tax income
$
—

 
$
—

 
$
—

 
$
(156
)
 
$
(196
)
 
$
(494
)
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, 2017
 
December 31, 2016
 
Fair
Value
 
Unrealized
Gains
 
Fair
Value
 
Unrealized
Gains
Description of Securities:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
6,662

 
$
272

 
$
7,430

 
$
319

U.S. Government Bonds
13,846

 
311

 
12,237

 
138

Municipal Debt Obligations
5,197

 
161

 
2,481

 
144

Corporate Debt Obligations
20,981

 
995

 
12,350

 
655

Total Debt Securities
46,686

 
1,739

 
34,498

 
1,256

Common Stock
53,489

 
30,766

 
61,884

 
34,066

Equity Mutual Funds
54,236

 
7,028

 
42,244

 
3,345

Institutional Funds - International Equity
26,149

 
3,174

 
—

 
—

Cash and Cash Equivalents
5,889

 
—

 
6,002

 
—

Total
$
186,449

 
$
42,707

 
$
144,628

 
$
38,667
Contractual Year For Maturity Of Available-For-Sale Securities
The contractual year for maturity of these available-for-sale securities as of June 30, 2017 is as follows (in thousands): 
 
Total
 
2017
 
2018
through
2021
 
2022 through 2026
 
2027 and Beyond
Federal Agency Mortgage Backed Securities
$
22,523

 
$
—

 
$
5

 
$
338

 
$
22,180

U.S. Government Bonds
59,050

 
5,893

 
24,224

 
15,981

 
12,952

Municipal Debt Obligations
18,028

 
796

 
6,215

 
9,743

 
1,274

Corporate Debt Obligations
31,233

 
—

 
12,309

 
8,949

 
9,975
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, 2017 and 2016 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,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Proceeds from sales or maturities of available-for-sale securities
$
36,476

 
$
16,634

 
$
62,531

 
$
40,712

 
$
113,087

 
$
106,121

Gross realized gains included in pre-tax income
$
5,322

 
$
2,409

 
$
7,909

 
$
4,241

 
$
12,880

 
$
12,805

Gross realized losses included in pre-tax income
(156
)
 
(299
)
 
(552
)
 
(587
)
 
(1,185
)
 
(1,262
)
Gross unrealized losses included in pre-tax income
—

 
—

 
—

 
(156
)
 
(196
)
 
(494
)
Net gains included in pre-tax income
$
5,166

 
$
2,110

 
$
7,357

 
$
3,498

 
$
11,499

 
$
11,049

Net unrealized holding gains (losses) included in accumulated other comprehensive income
$
4,458

 
$
2,790

 
$
12,179

 
$
4,980

 
$
15,643

 
$
2,623

Net gains reclassified from accumulated other comprehensive income
(5,166
)
 
(2,110
)
 
(7,357
)
 
(3,498
)
 
(11,499
)
 
(11,049
)
Net gains (losses) in other comprehensive
income
$
(708
)
 
$
680

 
$
4,822

 
$
1,482

 
$
4,144

 
$
(8,426
)
Fair Value, Measurement Inputs, Disclosure
The fair value of the Company's decommissioning trust funds and investments in debt securities at June 30, 2017 and December 31, 2016, 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, 2017
 
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
$
1,538

 
$
—

 
$
—

 
$
1,538

Available for Sale:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
22,523

 
$
—

 
$
22,523

 
$
—

U.S. Government Bonds
59,050

 
59,050

 
—

 
—

Municipal Debt Obligations
18,028

 
—

 
18,028

 
—

Corporate Debt Obligations
31,233

 
—

 
31,233

 
—

Subtotal, Debt Securities
130,834

 
59,050

 
71,784

 
—

Common Stock
54,207

 
54,207

 
—

 
—

Equity Mutual Funds
54,236

 
54,236

 
—

 
—

Institutional Funds-International Equity
26,149

 
26,149

 
—

 
—

Cash and Cash Equivalents
5,889

 
5,889

 
—

 
—

Total Available for Sale
$
271,315

 
$
199,531

 
$
71,784

 
$
—

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:
 
 
 
 
 
 
 
Federal Agency Mortgage Backed Securities
$
19,448

 
$
—

 
$
19,448

 
$
—

U.S. Government Bonds
61,868

 
61,868

 
—

 
—

Municipal Debt Obligations
16,144

 
—

 
16,144

 
—

Corporate Debt 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

 
$
—