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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Stock Compensation Expense by Plan Type
Our stock compensation expense for the three years ended December 31, 2017, is presented below ($000's omitted):
 
2017
 
2016
 
2015
Stock options
$
—

 
$
—

 
$
37

Restricted shares (including RSUs and performance shares)
24,207

 
18,626

 
16,852

Long-term incentive plans
9,476

 
3,602

 
7,863

 
$
33,683

 
$
22,228

 
$
24,752
Stock Option Activity Rollforward
A summary of stock option activity for the three years ended December 31, 2017, is presented below (000’s omitted, except per share data):
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average
Per Share
Exercise Price
 
Shares
 
Weighted-
Average
Per Share
Exercise Price
 
Shares
 
Weighted-
Average
Per Share
Exercise Price
Outstanding, beginning of year
3,623

 
$
12

 
6,040

 
$
19

 
9,370

 
$
23

Granted
—

 
—

 
—

 
—

 
—

 
—

Exercised
(2,353
)
 
12

 
(498
)
 
12

 
(904
)
 
12

Forfeited
(102
)
 
28

 
(1,919
)
 
34

 
(2,426
)
 
37

Outstanding, end of year
1,168

 
$
11

 
3,623

 
$
12

 
6,040

 
$
19

Options exercisable at year end
1,168

 
$
11

 
3,623

 
$
12

 
6,040

 
$
19

Weighted-average per share fair value of
       options granted during the year
$
—

 
 
 
$
—

 
 
 
$
—

 
 
Stock Options Weighted-average Remaining Contractual Lives
The following table summarizes information about our options outstanding at December 31, 2017: 
 
Options Outstanding
 
Options Exercisable
 
Number
Outstanding
(000's omitted)
 
Weighted-
Average
Remaining
Contract Life
(in years)
 
Weighted-
Average
Per Share
Exercise Price
 
Number
Exercisable
(000's omitted)
 
Weighted-
Average Per
Share
Exercise Price
$0.01 to $10.00
264

 
2.9
 
$
8

 
264

 
$
8

$10.01 to $20.00
904

 
1.6
 
12

 
904

 
12

 
1,168

 
1.9
 
$
11

 
1,168

 
$
11
Restricted Stock, RSUs, and Performance Shares Activity Rollforward
A summary of restricted share activity, including RSUs and performance shares, for the three years ended December 31, 2017, is presented below (000’s omitted, except per share data):
 
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average
Per Share
Grant Date
Fair Value
 
Shares
 
Weighted-
Average
Per Share
Grant Date
Fair Value
 
Shares
 
Weighted-
Average
Per Share
Grant Date
Fair Value
Outstanding, beginning of
       year
2,974

 
$
19

 
2,576

 
$
18

 
2,890

 
$
15

Granted
1,251

 
21

 
1,853

 
17

 
932

 
22

Distributed
(775
)
 
19

 
(546
)
 
20

 
(1,090
)
 
10

Forfeited
(179
)
 
19

 
(909
)
 
12

 
(156
)
 
19

Outstanding, end of year
3,271

 
$
19

 
2,974

 
$
19

 
2,576

 
$
18

Vested, end of year
152

 
$
17

 
123

 
$
15

 
89

 
$
14