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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted
The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the years ended December 31, 2014, 2013 and 2012.
 
2014
 
2013
 
2012
Dividend yield
1.60
%
 
1.92
%
 
2.00
%
Expected life of option
3.6 years

 
4.1 years

 
3.7 years

Risk-free interest rate
1.29
%
 
0.96
%
 
0.46
%
Expected stock price volatility
33.97
%
 
36.12
%
 
37.40
%
Summary of the status of stock options and changes during the period
A summary of the status of the Company's stock options as of December 31, 2014, 2013 and 2012 and changes during the years ended December 31, 2014, 2013 and 2012 are as follows:
 
2014
 
2013
 
2012
 
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Options
Outstanding
 
Weighted
Average
Exercise
Price
Balance at beginning of year
1,765,034

 
$
83.24

 
1,201,000

 
$
75.05

 
1,277,200

 
$
63.37

Granted
102,050

 
119.12

 
828,100

 
87.23

 
361,331

 
75.36

Exercised
(348,156
)
 
72.76

 
(223,531
)
 
53.93

 
(382,612
)
 
36.65

Lapsed or cancelled
(56,202
)
 
90.03

 
(40,535
)
 
83.94

 
(54,919
)
 
72.99

Balance at end of year
1,462,726

 
$
87.98

 
1,765,034

 
$
83.24

 
1,201,000

 
$
75.05

Options exercisable at end of year
428,951

 
$
90.32

 
461,458

 
$
89.38

 
479,913

 
$
86.85

Weighted average fair value of options granted during the year
$
2,841,678

 
 
 
$
18,041,576

 
 
 
$
6,602,967

 
 
Summary of restricted stock and charges during the period
A summary of the Company's restricted stock as of December 31, 2014, 2013 and 2012 and charges during the years ended December 31, 2014, 2013 and 2012 are as follows:
 
2014
 
2013
 
2012
Balance at beginning of year
2,994,197

 
2,804,901

 
2,912,456

Granted
9,550

 
192,563

 
92,729

Cancelled
(2,768
)
 
(3,267
)
 
(200,284
)
Balance at end of year
3,000,979

 
2,994,197

 
2,804,901

Vested during the year
75,043

 
21,074

 
408,800

Compensation expense recorded
$
9,658,019

 
$
6,713,155

 
$
6,930,381

Weighted average fair value of restricted stock granted during the year
$
1,141,675

 
$
17,386,949

 
$
7,023,942