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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Awards [Table Text Block]
Dollars in thousands
 
Shares(1)
 
Expense During Award Year(2)
 
Total Expense for Award
Estimated award:
 
 
 
 
 
 
2014-2016 grant(3)
 
27,887

 
$
168

 
$
1,418

Actual award:
 
 
 
 
 
 
2013-2015 grant
 
8,914

 
312

 
1,240

2012-2014 grant
 
8,621

 
582

 
1,821
Schedule Of Performance Based Award [Table Text Block]
Dollars in thousands
 
Performance Share Awards Outstanding
 
2016
 
Cumulative Expense
Performance Period
 
Target
 
Maximum
 
Expense
 
December 31, 2016
2014-16
 
39,725

 
79,450

 
$
168

 
$
1,418

2015-17
 
36,200

 
72,400

 
662

 
1,515

2016-18
 
27,950

 
55,900

 
478

 
478

Total
 
103,875

 
207,750

 
$
1,308

 
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
Number of RSUs
 
Weighted -
Average
Price Per RSU
Nonvested, December 31, 2013
 
44,567

 
$
46.27

Granted
 
38,765

 
42.19

Vested
 
(12,060
)
 
46.52

Forfeited
 
(478
)
 
45.47

Nonvested, December 31, 2014
 
70,794

 
44.00

Granted
 
37,264

 
46.29

Vested
 
(19,003
)
 
44.81

Forfeited
 
(468
)
 
44.99

Nonvested, December 31, 2015
 
88,587

 
44.78

Granted
 
40,271

 
54.36

Vested
 
(29,488
)
 
45.56

Forfeited
 
(9,397
)
 
44.59

Nonvested, December 31, 2016
 
89,973

 
48.85
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Option
Shares
 
Weighted -
Average
Price Per Share
 
Intrinsic
Value
(In millions)
Balance outstanding, December 31, 2013
 
492,150

 
$
42.89

 
$
0.6

Exercised
 
(69,662
)
 
39.82

 
0.5

Forfeited
 
(6,400
)
 
43.59

 
n/a

Balance outstanding, December 31, 2014
 
416,088

 
43.40

 
2.7

Exercised
 
(62,900
)
 
39.96

 
0.5

Forfeited
 
(500
)
 
45.74

 
n/a

Balance outstanding, December 31, 2015
 
352,688

 
44.00

 
2.3

Exercised
 
(172,525
)
 
43.61

 
2.0

Forfeited
 
—

 
n/a

 
n/a

Balance outstanding and exercisable, December 31, 2016
 
180,163

 
44.38

 
2.8
Schedule Of Stock Based Compensation Capitalized Under LTIP SOP and ESPP [Table Text Block]
In thousands
2016
2015
2014
Operations and maintenance expense, for stock-based compensation
$
2,370

$
2,673

$
2,309

Income tax benefit
(924
)
(1,012
)
(861
)
Net stock-based compensation effect on net income
$
1,446

$
1,661

$
1,448

Amounts capitalized for stock-based compensation
$
554

$
661

$
597