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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the activity under the Incentive Plan the previous directors' plan
A summary of the activity under the Incentive Plan and related information for the three years in the period ended December 31, 2015 follows: 
 
Year Ended December 31,
 
2015

 
2014

 
2013

Stock-based awards, beginning of year
1,057,732

 
1,788,168

 
1,770,061

Granted
251,789

 
269,129

 
134,752

Vested
(210,955
)
 
(931,767
)
 
(116,645
)
Forfeited
(6,304
)
 
(67,798
)
 
—

Stock-based awards, end of year
1,092,262

 
1,057,732

 
1,788,168

Weighted-average grant date fair value of:
 
 
 
 
 
Stock-based awards, beginning of year
$
24.01

 
$
23.81

 
$
23.97

Stock-based awards granted during the year
$
27.70

 
$
25.27

 
$
23.90

Stock-based awards vested during the year
$
25.05

 
$
24.13

 
$
26.35

Stock-based awards forfeited during the year
$
24.80

 
$
22.01

 
$
—

Stock-based awards, end of year
$
24.72

 
$
24.01

 
$
23.81

Grant date fair value of shares granted during the year
$
6,975,024

 
$
6,800,122

 
$
3,220,623
Summary of the Employee Stock Purchase Plan activity
A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2015 is as follows:
 
Year Ended December 31,
 
2015

 
2014

 
2013

Options outstanding, beginning of year
393,902

 
391,108

 
433,452

Granted
197,640

 
275,655

 
246,717

Exercised
(44,462
)
 
(51,078
)
 
(69,076
)
Forfeited
(47,176
)
 
(63,908
)
 
(49,434
)
Expired
(158,946
)
 
(157,875
)
 
(170,551
)
Options outstanding and exercisable, end of year
340,958

 
393,902

 
391,108

Weighted-average exercise price of:
 
 
 
 
 
Options outstanding, beginning of year
$
19.17

 
$
17.05

 
$
16.78

Options granted during the year
$
23.22

 
$
18.11

 
$
20.41

Options exercised during the year
$
19.41

 
$
17.76

 
$
17.09

Options forfeited during the year
$
19.90

 
$
18.58

 
$
17.98

Options expired during the year
$
20.41

 
$
15.80

 
$
17.99

Options outstanding, end of year
$
20.70

 
$
19.17

 
$
17.05

Weighted-average fair value of options granted during the year (calculated as of the grant date)
$
5.39

 
$
4.35

 
$
5.08

Intrinsic value of options exercised during the year
$
380,615

 
$
436,547

 
$
375,335

Intrinsic value of options outstanding and exercisable (calculated as of December 31)
$
2,597,238

 
$
3,209,456

 
$
1,665,331

Exercise prices of options outstanding (calculated as of December 31)
$
20.70

 
$
19.17

 
$
17.05

Weighted-average contractual life of outstanding options (calculated as of December 31, in years)
0.8

 
0.8

 
0.8
Fair value of options issued based on weighted-average assumptions
 
2015

 
2014

 
2013

Risk-free interest rates
0.67
%
 
0.38
%
 
0.25
%
Expected dividend yields
4.79
%
 
4.94
%
 
5.17
%
Expected life (in years)
1.38

 
1.39

 
1.35

Expected volatility
21.0
%
 
23.0
%
 
25.6
%
Expected forfeiture rates
85
%
 
75
%
 
85
%