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Share-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 (in thousands except for per share amounts): 
 
 
Shares / Units
 
Grant Date
Fair Value
Per Share
Nonvested, beginning of period
 
1,371

 
$
46

Granted
 
730

 
$
56

Vested
 
(408
)
 
$
51

Forfeited
 
(92
)
 
$
50

Nonvested, end of period
 
1,601

 
$
49
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, 2017 (in thousands except for per share amounts): 
 
 
Units
 
Weighted-Average
Grant Date
Fair Value
Per Share
Nonvested, beginning of period
 
124

 
$
54

Granted
 
56

 
$
52

Vested
 
(49
)
 
$
60

Forfeited
 
(30
)
 
$
59

Nonvested, end of period
 
101

 
$
53
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Assumptions used in calculating the lattice-based fair value of options granted during 2015 were as follows:
 
 
2015
Expected average term (in years)
 
6.0

Expected volatility
 
24% - 30%

Weighted average volatility
 
28
%
Expected dividend yield
 
2.0
%
Risk-free interest rate
 
0.1% - 2.0%
Summary of Stock Option Transactions
The following table summarizes the stock option transactions for the year ended December 31, 2017 (in thousands except for per share amounts): 
 
 
Options
 
Weighted-
Average Price
Options outstanding, beginning of period
 
1,878

 
$
49

Options exercised
 
(282
)
 
$
40

Options forfeited
 
(192
)
 
$
68

Options outstanding, end of period
 
1,404

 
$
48

Exercisable, end of period
 
1,309

 
$
47
Summary of Aggregate Intrinsic Value Related to Options Outstanding, Exercisable and Exercised
The following table summarizes the aggregate intrinsic value related to options outstanding, exercisable and exercised as of and for the years ended December 31 (in thousands): 
 
 
2017
 
2016
 
2015
Exercised
 
$
4,051

 
$
9,595

 
$
9,890

Outstanding
 
$
11,711

 
$
22,383

 
$
16,605

Exercisable
 
$
11,711

 
$
22,383

 
$
16,605
Stock Options Outstanding By Price Range
Stock options outstanding at December 31, 2017 were as follows (options in thousands): 
Price Range
 
Weighted-Average
Contractual Life
 
Options
 
Weighted-Average
Exercise Price
$10.01 to $20
 
1.2
 
151

 
$
13

$20.01 to $30
 
2.1
 
145

 
$
24

$30.01 to $40
 
0.1
 
37

 
$
39

$40.01 to $50
 
3.6
 
239

 
$
44

$50.01 to $60
 
4.6
 
193

 
$
52

$60.01 to $70
 
5.2
 
639

 
$
63

Options outstanding
 
4.0
 
1,404

 
$
48

Options exercisable
 
3.7
 
1,309

 
$
47
Assumptions Used In Calculating Fair Value of Stock Appreciation Rights
The assumptions used to determine the fair value of the SAR awards at December 31, 2017 and 2016 were as follows: 
 
 
2017
 
2016
Expected average term (in years)
 
5.7

 
5.2 - 5.7

Expected volatility
 
28% - 31%

 
28% - 31%

Expected dividend yield
 
2.9
%
 
2.4
%
Risk-free interest rate
 
1.3% - 2.5%

 
0.5% - 2.6%
Summary of Stock Appreciation Right Transactions
The following table summarizes the SAR transactions for the year ended December 31, 2017 (in thousands except for per share amounts): 
 
 
SARs
 
Weighted-Average
Price
Outstanding, beginning of period
 
75

 
$
37

Granted
 
—

 
$
—

Exercised
 
(32
)
 
$
31

Forfeited
 
(16
)
 
$
62

Outstanding, end of period
 
27

 
$
30

Exercisable, end of period
 
27

 
$
30