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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly results
 
 
2015 Quarter Ended
 
2014 Quarter Ended
 
 
March 31
 
June 30
 
Sept. 30
 
Dec. 31
 
March 31
 
June 30
 
Sept. 30
 
Dec. 31
Operating Revenues
 
$
382,952

 
$
177,710

 
$
141,062

 
$
257,844

 
$
350,201

 
$
133,271

 
$
122,427

 
$
281,097

Expenses:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Cost of Sales - (Excluding depreciation)
 
241,707

 
90,945

 
99,124

 
127,566

 
228,138

 
78,947

 
76,073

 
153,794

Operations and Maintenance Including Fixed Charges
 
71,279

 
62,634

 
63,867

 
71,148

 
64,684

 
56,174

 
56,039

 
69,384

Income Taxes
 
16,613

 
(3,279
)
 
(10,968
)
 
(1,006
)
 
11,869

 
(9,510
)
 
(8,325
)
 
10,415

Energy and Other Taxes
 
2,196

 
1,265

 
1,231

 
1,334

 
1,953

 
1,241

 
1,196

 
1,330

Total Expenses
 
331,795

 
151,565

 
153,254

 
199,042

 
306,644

 
126,852

 
124,983

 
234,923

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other Income and Expense
 
2,696

 
(12,804
)
 
(340
)
 
(7,854
)
 
4,654

 
3,282

 
(1,720
)
 
(2,182
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income (Loss) from Continuing Operations
 
53,853

 
13,341

 
(12,532
)
 
50,948

 
48,211

 
9,701

 
(4,276
)
 
43,992

Loss from Discontinued Operations  -  (Net of tax benefit)
 
(276
)
 
(74
)
 
(91
)
 
(62
)
 
(313
)
 
(80
)
 
(120
)
 
(69
)
Net Income (Loss)
 
$
53,577

 
$
13,267

 
$
(12,623
)
 
$
50,886

 
$
47,898

 
$
9,621

 
$
(4,396
)
 
$
43,923

 
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Basic Earnings Per Common Share:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Continuing Operations
 
$
0.79

 
$
0.19

 
$
(0.18
)
 
$
0.73

 
$
0.74

 
$
0.15

 
$
(0.07
)
 
$
0.66

Discontinued Operations
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Basic Earnings Per Common Share
 
$
0.79

 
$
0.19

 
$
(0.18
)
 
$
0.73

 
$
0.74

 
$
0.15

 
$
(0.07
)
 
$
0.66

Average Shares of Common Stock Outstanding - Basic
 
68,397

 
68,467

 
68,607

 
69,460

 
65,530

 
65,926

 
66,332

 
67,304

 
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Diluted Earnings Per Common Share:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Continuing Operations
 
$
0.79

 
$
0.19

 
$
(0.18
)
 
$
0.73

 
$
0.74

 
$
0.15

 
$
(0.07
)
 
$
0.65

Discontinued Operations
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Diluted Earnings Per Common Share
 
$
0.79

 
$
0.19

 
$
(0.18
)
 
$
0.73

 
$
0.74

 
$
0.15

 
$
(0.07
)
 
$
0.65

Average Shares of Common Stock Outstanding - Diluted
 
68,618

 
68,653

 
68,607

 
69,646

 
65,684

 
66,074

 
66,332

 
67,454