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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option rights
The fair value of the Company’s option rights was estimated at the date of grant using a Black-Scholes-Merton option-pricing model with the following weighted-average assumptions for all options granted:

 
2016
 
2015
 
2014
Risk-free interest rate
1.24%
 
1.37%
 
1.47%
Expected life of option rights
5.05 years
 
5.05 years
 
5.10 years
Expected dividend yield
of stock
1.06%
 
1.13%
 
1.19%
Expected volatility of stock
.212
 
.245
 
.223
Company's non-qualified and incentive stock option right activity for employees and nonemployee directors
A summary of the Company’s non-qualified and incentive stock option right activity is shown in the following table:
 
2016
 
2015
 
2014
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
Outstanding beginning
of year
5,219,506

 
$
141.58

 
 
 
5,699,892

 
$
117.31

 
 
 
6,484,592

 
$
96.25

 
 
Granted
712,967

 
271.46

 
 
 
697,423

 
241.84

 
 
 
672,565

 
224.65

 
 
Exercised
(733,876
)
 
108.81

 
 
 
(1,133,287
)
 
79.41

 
 
 
(1,421,045
)
 
70.71

 
 
Forfeited
(26,653
)
 
232.83

 
 
 
(43,632
)
 
193.60

 
 
 
(31,617
)
 
158.92

 
 
Expired
(8,235
)
 
176.28

 
 
 
(890
)
 
87.59

 
 
 
(4,603
)
 
86.66

 
 
Outstanding end of year
5,163,709

 
$
163.61

 
$
545,531

 
5,219,506

 
$
141.58

 
$
616,866

 
5,699,892

 
$
117.31

 
$
830,647

Exercisable at end of year
3,783,755

 
$
130.59

 
$
522,921

 
3,807,351

 
$
110.96

 
$
565,934

 
4,095,246

 
$
87.79

 
$
717,691
Summary of the company's restricted stock activity
A summary of the Company’s restricted stock and RSU activity for the years ended December 31 is shown in the following table:
 
2016
 
2015
 
2014
Outstanding at beginning
of year
467,744

 
655,276

 
749,382

Granted
99,662

 
112,494

 
201,412

Vested
(166,405
)
 
(290,901
)
 
(294,438
)
Forfeited
(3,675
)
 
(9,125
)
 
(1,080
)
Outstanding at end of year
397,326

 
467,744

 
655,276