XML 41 R31.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Performance Based Award [Table Text Block]
Dollars in thousands
 
Performance Share Awards Outstanding
 
2017
 
Cumulative Expense
Performance Period
 
Target
 
Maximum
 
Expense/(Reversal)
 
December 31, 2017
2015-17
 
29,967

 
59,934

 
$
(346
)
 
$
1,169

2016-18
 
24,826

 
49,652

 
337

 
815

2017-19
 
32,680

 
65,360

 
942

 
942

Total
 
87,473

 
174,946

 
$
933

 
 
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, 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

Granted
 
32,168

 
60.51

Vested
 
(35,341
)
 
47.07

Forfeited
 
(2,278
)
 
53.78

Nonvested, December 31, 2017
 
84,522

 
53.90
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Option
Shares
 
Weighted -
Average
Price Per Share
 
Intrinsic
Value
(In millions)
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, December 31, 2016
 
180,163

 
44.38

 
2.8

Exercised
 
(88,275
)
 
44.33

 
1.8

Forfeited
 
(200
)
 
41.15

 
n/a

Balance outstanding and exercisable, December 31, 2017
 
91,688

 
44.43

 
1.4
Schedule Of Stock Based Compensation Capitalized Under LTIP SOP and ESPP [Table Text Block]
In thousands
2017
2016
2015
Operations and maintenance expense, for stock-based compensation
$
2,354

$
2,370

$
2,673

Income tax benefit
(930
)
(924
)
(1,012
)
Net stock-based compensation effect on net income (loss)
$
1,424

$
1,446

$
1,661

Amounts capitalized for stock-based compensation
$
528

$
554

$
661
Long Term Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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:
 
 
 
 
 
 
2015-2017 grant(3)
 
18,300

 
$
(346
)
 
$
1,169

Actual award:
 
 
 
 
 
 
2014-2016 grant
 
31,388

 
168

 
1,685

2013-2015 grant
 
8,914

 
312

 
1,240


(1)  
In addition to common stock shares, a participant also receives a dividend equivalent cash payment equal to the number of shares of common stock received on the award payout multiplied by the aggregate cash dividends paid per share during the performance period.
(2)  
Amount represents the expense recognized in the third year of the vesting period noted above. For the 2015-2017 grant, we did not meet targets and reversed expense during 2017 that had been previously recognized.
(3) 
This represents the estimated number of shares to be awarded as of December 31, 2017 as certain performance share measures had been achieved. Amounts are subject to change with final payout amounts authorized by the Board of Directors in February 2018.