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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Equity Awards Activity
A summary of the equity awards authorized and available for future grants under the 2015 Plan is as follows:
Available for future grants at December 31, 2016
2,164,297

Newly authorized options

Granted
(726,862
)
Cancellation and forfeitures

Plan termination

Available for future grants at December 31, 2017
1,437,435

Summary of SARs Activity
A summary of the Company’s SARs outstanding under the 2015 Plan is as follows:
 
2017
 
2016
 
2015
SARs
Shares
 
Weighted-
Average
Exercise 
Price
 
Shares
 
Weighted-
Average
Exercise 
Price
 
Shares
 
Weighted-
Average
Exercise 
Price
Outstanding at beginning of year
1,740,786

 
$
56.15

 
1,397,611

 
$
56.78

 
1,292,142

 
$
42.20

Granted
402,029

 
98.87

 
627,971

 
52.13

 
332,159

 
107.31

Exercised
(250,326
)
 
48.66

 
(160,946
)
 
35.37

 
(179,702
)
 
40.71

Forfeited
(66,550
)
 
75.38

 
(115,215
)
 
65.74

 
(45,441
)
 
75.26

Expired
(7,948
)
 
108.20

 
(8,635
)
 
88.65

 
(1,547
)
 
47.11

Outstanding at end of year
1,817,991

 
$
65.73

 
1,740,786

 
$
56.15

 
1,397,611

 
$
56.78

Exercisable at end of year
874,942

 
$
50.86

 
828,754

 
$
45.14

 
736,075

 
$
35.90

Weighted-Average Assumptions Used for Grants of SARs
The following table shows the weighted-average assumptions used for grants of SARs, as well as the fair value of the grants based on those assumptions:
 
2017
 
2016
 
2015
Expected dividend yield
0%
 
0%
 
0%
Forfeiture rate
9.37%
 
9.01%
 
10.24%
Volatility
35.49%
 
43.14%
 
33.98%
Risk free interest rate
1.77%
 
1.29%
 
1.53%
Range of interest rates
0.71%-2.41%
 
0.25%-1.75%
 
0.02% - 2.14%
Expected weighted-average life (in years)
4.13
 
5.33
 
5.32
Fair value of SARs granted
$12.01
 
$12.65
 
$11.63
Weighted-average grant date fair value of SARs granted
(per underlying share)
$29.86
 
$20.18
 
$35.00
Summary of Outstanding and Exercisable Options
The following table summarizes information about non-qualified stock options outstanding at December 31, 2017:
 
Outstanding             
 
Exercisable         
Aggregate intrinsic value (in millions)
$
1

 
$
1

Weighted-average remaining contractual term (in years)
0.70

 
0.70

The following table summarizes information about SARs outstanding at December 31, 2017:
 
Outstanding             
 
Exercisable         
Aggregate intrinsic value (in millions)
$
70

 
$
47

Weighted-average remaining contractual term (in years)
6.1

 
4.7

Summary of Restricted Stock Award Activity
A summary of information relative to the Company’s restricted stock awards is as follows:
 
 
2017
 
2016
 
2015
Restricted Stock Awards
 
Shares
 
Weighted-Average
Grant Date Fair Value
 
Shares
 
Weighted-Average
Grant Date Fair Value
 
Shares
 
Weighted-Average
Grant Date Fair Value
Outstanding at beginning of year
 
622,814

 
$
70.19

 
566,447

 
$
77.68

 
691,621

 
$
60.06

Granted
 
199,629

 
98.90

 
389,193

 
51.93

 
185,782

 
107.17

Released
 
(165,846
)
 
75.90

 
(275,229
)
 
59.39

 
(253,801
)
 
51.95

Forfeited
 
(27,955
)
 
72.81

 
(57,597
)
 
70.50

 
(57,155
)
 
75.11

Outstanding at end of year
 
628,642

 
$
77.70

 
622,814

 
$
70.19

 
566,447

 
$
77.68

Summary of Performance Share Award Activity
A summary of information relative to the Company’s performance awards is as follows:
 
 
2017
 
2016
 
2015
Performance Share Awards
 
Shares
 
Weighted-Average
Grant Date Fair Value
 
Shares
 
Weighted-Average
Grant Date Fair Value
 
Shares
 
Weighted-Average
Grant Date Fair Value
Outstanding at beginning of year
 
379,226

 
$
70.14

 
332,630

 
$
73.40

 
374,180

 
$
61.53

Granted
 
79,423

 
98.97

 
172,024

 
51.01

 
106,411

 
75.77

Released
 
(2,029
)
 
62.70

 
(111,325
)
 
46.58

 
(120,000
)
 
38.67

Forfeited
 
(190,873
)
 
73.09

 
(14,103
)
 
75.73

 
(27,961
)
 
73.45

Outstanding at end of year
 
265,747

 
$
77.04

 
379,226

 
$
70.14

 
332,630

 
$
73.40

Summary of Non-qualified Option Activity
A summary of the Company’s options outstanding under the 2006 Plan is as follows:
 
2017
 
2016
 
2015
Non-qualified Options
Shares
 
Weighted-
Average
Exercise Price
 
Shares
 
Weighted-
Average
Exercise Price
 
Shares
 
Weighted-
Average
Exercise Price
Outstanding at beginning of year
154,551

 
$
35.96

 
204,434

 
$
36.66

 
415,960

 
$
40.19

Granted

 

 

 

 

 

Exercised
(132,905
)
 
36.86

 
(47,393
)
 
38.60

 
(209,976
)
 
43.53

Forfeited

 

 

 

 

 

Expired
(5,941
)
 
41.25

 
(2,490
)
 
43.35

 
(1,550
)
 
51.62

Outstanding at end of year
15,705

 
$
26.34

 
154,551

 
$
35.96

 
204,434

 
$
36.66

Exercisable at end of year
15,705

 
$
26.34

 
154,551

 
$
35.96

 
204,434

 
$
36.66