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Share-Based Awards (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Restricted Stock Units and Performance Shares Settled in Stock Transactions
The following table summarizes the activity for these awards for the year ended December 31, 2018 (in thousands, except for per share amounts): 
 
 
Shares / Units
 
Weighted-Average
Fair Value
Per Share
Nonvested, beginning of period
 
1,601

 
$
49

Granted
 
927

 
$
47

Vested
 
(485
)
 
$
52

Forfeited
 
(149
)
 
$
49

Nonvested, end of period
 
1,894

 
$
48

Summary of Restricted Stock Units and Performance Shares Settled in Cash Transactions
The following table summarizes the activity for these awards for the year ended December 31, 2018 (in thousands, except for per share amounts): 
 
 
Units
 
Weighted-Average
Fair Value
Per Share
Nonvested, beginning of period
 
101

 
$
43

Granted
 
71

 
$
34

Vested
 
(45
)
 
$
48

Forfeited
 
(22
)
 
$
43

Nonvested, end of period
 
105

 
$
37

Summary of Stock Option Transactions
The following table summarizes the stock option transactions for the year ended December 31, 2018 (in thousands, except for per share amounts): 
 
 
Options
 
Weighted-
Average Price
Outstanding, beginning of period
 
1,404

 
$
48

Exercised
 
(160
)
 
$
22

Forfeited
 
(189
)
 
$
59

Outstanding, end of period
 
1,055

 
$
50

Exercisable, end of period
 
1,055

 
$
50

Summary of Aggregate Intrinsic Value Related to Options Outstanding, Exercisable and Exercised
The following table summarizes the aggregate intrinsic value related to options exercised, outstanding and exercisable as of and for the years ended December 31 (in thousands): 
 
 
2018
 
2017
 
2016
Exercised
 
$
3,855

 
$
4,051

 
$
9,595

Outstanding
 
$
2,366

 
$
11,711

 
$
22,383

Exercisable
 
$
2,366

 
$
11,711

 
$
22,383

Stock Options Outstanding By Price Range
Stock options outstanding at December 31, 2018 were as follows (options in thousands): 
Price Range
 
Weighted-Average
Contractual Life
 
Options
 
Weighted-Average
Exercise Price
$10.01 to $20
 
0.1
 
50

 
$
12

$20.01 to $30
 
1.1
 
127

 
$
24

$30.01 to $40
 
0.0
 

 
$

$40.01 to $50
 
2.6
 
219

 
$
44

$50.01 to $60
 
3.8
 
171

 
$
52

$60.01 to $70
 
5.2
 
488

 
$
63

Options outstanding
 
4.0
 
1,055

 
$
50

Options exercisable
 
4.0
 
1,055

 
$
50

Assumptions Used In Calculating Fair Value of Stock Appreciation Rights
The assumptions used to determine the fair value of the unvested SAR awards at December 31, 2017 were as follows: 
 
 
2017
Expected average term (in years)
 
5.7

Expected volatility
 
28% - 31%

Expected dividend yield
 
2.9
%
Risk-free interest rate
 
1.3% - 2.5%

Summary of Stock Appreciation Right Transactions
The following table summarizes the SAR transactions for the year ended December 31, 2018 (in thousands, except per share amounts): 
 
 
SARs
 
Weighted-Average
Price
Outstanding, beginning of period
 
27

 
$
30

Exercised
 
(14
)
 
$
24

Outstanding, end of period
 
13

 
$
36

Exercisable, end of period
 
13

 
$
36