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Employee Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summarizes of Company's Non-Vested ESP/EIP Awards
The following table summarizes the status of the Company’s non-vested restricted Class A Stock awards under the EIP, ESP and OIP for the year ended December 31, 2014:
 
Number of Class
A Shares
Subject to
Restricted Stock  Awards
 
Weighted
Average Fair
Value
 
Remaining
Contractual
Life
Nonvested at beginning of year
1,247,476

 
$
17.87

 
2.0 Years

Granted
345,260

 
22.26

 
2.2 Years

Vested
(219,180
)
 
11.72

 
—

Forfeited or expired
(134,210
)
 
18.43

 
—

Nonvested at end of year
1,239,346

 
$
20.12

 
1.7 Years
Schedule of Fair Value of Awarded Stock Option Estimated on Grant Date Using Black-Scholes Model
The fair value of each award of stock options was estimated on the grant date using the Black-Scholes model with the following assumptions:
 
 
 
Grant Date Assumptions
 
2014
 
2013
 
2012
 
2011
 
2010
Expected term (1)
5 years
 
5 years
 
5 years
 
5 years
 
4.5 years
Expected volatility factor (2)
56.31
%
 
53.82
%
 
54.95
%
 
52.52
%
 
48.58
%
Risk-free interest rate (3)
1.49
%
 
0.84
%
 
0.70
%
 
2.00
%
 
2.62
%
Actual dividends (4)
$
0.44

 
$
0.44

 
$
0.44

 
$
0.44

 
$
0.44

 
(1)
The expected term was determined based on actual awards.
(2)
The volatility factor was measured using the weighted average of historical daily price changes of the Company’s Class A Stock over a historical period commensurate to the expected term of the awards.
(3)
The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at the time of grant.
(4)
Actual dividends were used to compute the expected annual dividend yield.
Schedule of Stock Option Activity
Stock option activity under the OIP and EIP since January 1, 2013 is summarized as follows:
 
Year Ended December 31,
 
2014
 
2013
 
Number of
Options
 
Weighted Average
Exercise Price
 
Number of
Options
 
Weighted Average
Exercise Price
Options outstanding at beginning of year
72,573

 
$
24.46

 
86,803

 
$
23.35

Options granted
2,976

 
23.49

 
951

 
17.20

Options exercised
(15,000
)
 
12.33

 
(12,165
)
 
12.30

Options forfeited or expired
(15,000
)
 
33.22

 
(3,016
)
 
39.45

Options outstanding at end of year
45,549

 
$
25.50

 
72,573

 
$
24.46

Options vested at end of year
30,513

 
$
25.99

 
45,683

 
$
23.34

Weighted average fair value of options granted during the year
$
9.94

 
 
 
$
6.60

 
 
Summarizes Stock Options Outstanding and Exercisable
The following table summarizes stock options outstanding and exercisable as of December 31, 2014:
Range of Exercise Prices
Number of
Options
Outstanding
 
Weighted
Average
Remaining
Contractual Life
 
Weighted
Average
Exercise Price of
Outstanding
Options
 
Number of
Options
Exercisable
(Vested)
 
Weighted
Average
Exercise Price of
Vested Options
$17.20 - $25.00
8,216

 
2.28 Years
 
$
22.45

 
3,097

 
$
24.27

$25.01 - $26.21
37,333

 
1.00 Year
 
26.18

 
27,416

 
26.19

$17.20 - $26.21
45,549

 
1.23 Years
 
$
25.50

 
30,513

 
$
25.99
Summarizes of Company's Non-Vested Options
The following table summarizes the status of the Company’s non-vested options for the year ended December 31, 2014:
 
Number of
Options
 
Weighted
Average Fair
Value
Nonvested at beginning of year
26,890

 
$
10.86

Granted
2,976

 
9.94

Vested
(14,830
)
 
11.38

Nonvested at end of year
15,036

 
$
10.17
Stock Appreciation Rights
The following table summarized the status of the Company’s outstanding OARs awards as of December 31, 2014:
Grant Date
Number of
OARs
Outstanding
 
Strike Price
 
Remaining
Contractual
Life
 
Fair Value at
December 31, 2014
January 19, 2010
235,890

 
$
30.68

 
18 Days
 
$
—

January 13, 2011
326,480

 
26.35

 
1 Year
 
1.63

January 19, 2012
366,650

 
18.94

 
2 Years
 
5.71

January 14, 2013
403,340

 
15.94

 
3 Years
 
8.36

January 14, 2014
508,550

 
23.48

 
4 Years
 
6.94

 
1,840,910

 
 
 
 
 
 
Total weighted average values
 
 
$
22.36

 
2.4 Years
 
$
5.17