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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
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:
 
2013
 
2012
 
2011
Risk-free interest rate
0.59 - 0.63%

 
0.68 - 1.39%

 
1.22 - 2.78%

Dividend yield
5.00
%
 
6.75
%
 
6.75
%
Volatility factors of the expected market price for our common stock
24.2 - 31.7%

 
35.9 - 42.9%

 
35.7 - 44.3%

Weighted average expected life of options
4.17 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 2013:
 
Shares
 
Range of Exercise
Prices
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Intrinsic
Value
($000’s)
Outstanding as of December 31, 2012
1,909,999

 
$21.57 - $57.19
 
$
47.20

 
 
 
 

Options granted
512,706

 
65.93 - 73.20
 
67.36

 
 
 
 

Options exercised
(149,340
)
 
22.15 - 57.19
 
48.01

 
 
 
 

Options forfeited
(14,602
)
 
55.39 - 70.34
 
67.98

 
 
 
 
Outstanding as of December 31, 2013
2,258,763

 
21.57 - 73.20
 
51.59

 
6.6
 
$
17,870

Exercisable as of December 31, 2013
1,724,083

 
$21.57 - $65.93
 
$
47.65

 
5.9
 
$
17,613
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, 2013, and changes during the year ended December 31, 2013 follows:
 
Restricted
Stock
 
Weighted
Average
Grant Date
Fair Value
 
Restricted
Stock Units
 
Weighted
Average
Grant Date
Fair Value
Nonvested at December 31, 2012
591,884

 
$
52.66

 
6,825

 
$
50.34

Granted
189,659

 
67.05

 
4,635

 
64.72

Vested
(247,411
)
 
55.09

 
(3,592
)
 
46.68

Forfeited
(25,016
)
 
56.31

 
(352
)
 
53.74

Nonvested at December 31, 2013
509,116

 
$
56.66

 
7,516

 
$
60.80
Stock Options
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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, 2013 and changes during the year then ended follows:
 
Shares
 
Weighted Average
Grant Date Fair
Value
Nonvested at beginning of year
421,426

 
$
10.86

Granted
512,706

 
9.25

Vested
(384,844
)
 
10.66

Forfeited
(14,602
)
 
7.88

Nonvested at end of year
534,686

 
$
9.54