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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of assumptions used in estimating fair value of stock options using Black-Scholes option pricing model
In determining the estimated fair value of our stock options as of the date of grant, we used the Black-Scholes option pricing model with the following assumptions:
 
2012
 
2011
 
2010
Risk-free interest rate
0.68 - 1.39%

 
1.22 - 2.78%

 
2.00 - 3.45%

Dividend yield
6.75
%
 
6.75
%
 
6.75
%
Volatility factors of the expected market price for our common stock
35.9 - 42.9%

 
35.7 - 44.3%

 
37.1 - 44.6%

Weighted average expected life of options
4.25 - 7.0 years

 
4.25 - 7.0 years

 
4.25 - 7.0 years
Summary of stock option activity
The following is a summary of stock option activity in 2012:

Shares
 
Range of Exercise
Prices
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Intrinsic
Value
($000’s)
Outstanding as of December 31, 2011
2,047,005

 
$11.45 - $57.19
 
$
42.10

 
 
 
 

Options granted
459,015

 
55.13 - 55.69
 
55.58

 
 
 
 

Options exercised
(596,021
)
 
11.45 - 57.19
 
36.14

 
 
 
 

Outstanding as of December 31, 2012
1,909,999

 
11.86 - 57.19
 
47.20

 
6.9
 
$
33,469

Exercisable as of December 31, 2012
1,488,579

 
$11.86 - $57.19
 
$
44.96

 
6.3
 
$
29,410
Summary of status of nonvested stock options and changes during the year
A summary of the status of our nonvested stock options as of December 31, 2012 and changes during the year then ended follows:
 
Shares
 
Weighted Average
Grant Date Fair
Value
Nonvested at beginning of year
361,040

 
$
10.76

Granted
459,015

 
10.54

Vested
(398,629
)
 
10.40

Nonvested at end of year
421,426

 
$
10.86
Summary of status of nonvested restricted stock and restricted stock units and changes during the year
A summary of the status of our nonvested restricted stock and restricted stock units as of December 31, 2012, and changes during the year ended December 31, 2012 follows:
 
Restricted
Stock
 
Weighted
Average
Grant Date
Fair Value
 
Restricted
Stock Units
 
Weighted
Average
Grant Date
Fair Value
Nonvested at December 31, 2011
592,198

 
$
50.09

 
33,289

 
$
50.04

Granted
276,484

 
55.61

 
4,112

 
55.13

Vested
(271,224
)
 
50.12

 
(30,576
)
 
50.65

Forfeited
(5,574
)
 
49.36

 
—

 
—

Nonvested at December 31, 2012
591,884

 
$
52.66

 
6,825

 
$
50.34