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Stock Incentive Compensation and Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Performance Shares, Valuation Assumptions
The following are the weighted average-assumptions used to estimate the fair value for all Performance Shares issued in each respective year.
 
 
 
 
 
 
 
 
Performance Shares
 
 
Year ended December 31,
2014
 
2013
 
 
Expected volatility (1)
14.5% - 18.6%
 
19.0% - 19.6%
 
 
Expected term (in years)
n/a
 
n/a
 
 
Expected dividend yield
n/a
 
n/a
 
 
Risk-free interest rate (1)
0.08% - 1.65%
 
0.09% - 1.39%
 
 
 
 
 
 
 
(1)
The expected volatility and risk-free interest rate applied are specific to each tranche of Performance Shares.
Schedule of Share-based Compensation, 2001 Stock Incentive Plan, Non-Employee Director Stock Incentive Plan and Premium Option Plan
Premium Option Plan
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Weighted
options
outstanding
 
Weighted
average
exercise price
 
Weighted
average
remaining
contractual 
life
 
Aggregate
intrinsic  value
 
Range of exercise
prices
 
 
Balance, December 31, 2011
1,192,000

 
$
73.94

 
 
 
$

 
$73.06 - $74.24

 
 
Options granted

 

 
 
 
 
 
 
 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(350,000
)
 
74.24

 
 
 
1,250

 
 
 
 
Balance, December 31, 2012
842,000

 
$
73.82

 
 
 
$
6,265

 
$73.06 - $74.24

 
 
Options granted

 

 
 
 
 
 
 
 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(270,000
)
 
74.24

 
 
 
4,921

 
 
 
 
Balance, December 31, 2013
572,000

 
$
73.62

 
 
 
$
13,567

 
$73.06 - $74.24

 
 
Options granted

 

 
 
 
 
 
 
 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(572,000
)
 
73.62

 
 
 
13,414

 
 
 
 
Balance, December 31, 2014

 
$

 
0.0
 
$

 
$

 
 
Total options exercisable at December 31, 2014

 
$

 
0.0
 
$

 
$

 
 
 
 
 
 
 
 
 
 
 
 
 
2001 Stock Incentive and Non-Employee Director Stock Incentive Plans
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted
options
outstanding
 
Weighted
average
exercise price
 
Weighted
average
remaining
contractual
 life
 
Aggregate
intrinsic
value
 
Range of exercise prices
 
 
Balance, December 31, 2011
1,973,307

 
$
47.33

 
4.6
 
$
53,363

 
$37.51 - $59.66

 
 
Options granted

 

 
 
 
 
 

 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(240,668
)
 
45.30

 
 
 
$
7,910

 
 
 
 
Balance, December 31, 2012
1,732,639

 
$
47.61

 
3.7
 
$
58,305

 
$37.51 - $59.66

 
 
Options granted

 

 
 
 
 
 

 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(904,547
)
 
46.55

 
 
 
$
36,800

 
 
 
 
Balance, December 31, 2013
828,092

 
$
48.77

 
2.9
 
$
40,221

 
$37.51 - $59.66

 
 
Options granted

 

 
 
 
 
 

 
 
Options forfeited

 

 
 
 
 
 
 
 
 
Options expired

 

 
 
 
 
 
 
 
 
Options exercised
(60,262
)
 
$
49.52

 
 
 
$
2,900

 
 
 
 
Balance, December 31, 2014
767,830

 
$
48.71

 
2.0
 
$
37,246

 
$37.51 - $59.66

 
 
Total options exercisable at December 31, 2014
767,830

 
$
48.71

 
2.0
 
$
37,246

 
$37.51 - $59.66

 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, 2010 Cash Settled Restricted Stock Unit Plan and 2010 Performance-Based Equity Incentive Plan
2010 Cash Settled Restricted Stock Unit Plan and 2010 Performance-Based Equity Incentive Plan
 
 
 
 
 
 
 
 
 
 
Cash Settled
Restricted 
Stock
Unit Plan
 
Performance Shares (1)
 
 
 
Number of
shares
 
Number of
shares
 
Weighted
average 
grant-date fair value
 
 
Nonvested at December 31, 2011
422,973

 
289,867

 
$
30.06

 
 
Awards granted
225,105

 
144,635

 
$
28.17

 
 
Awards vested
(128,401
)
 
(70,843
)
 
 
 
 
Awards forfeited
(26,121
)
 
(4,139
)
 
 
 
 
Nonvested at December 31, 2012
493,556

 
359,520

 
$
29.46

 
 
Awards granted
149,760

 
134,358

 
$
33.46

 
 
Awards vested
(176,265
)
 
(24,606
)
 
 
 
 
Awards forfeited
(72,906
)
 
(109,729
)
 
 
 
 
Nonvested at December 31, 2013
394,145

 
359,543

 
$
30.55

 
 
Awards granted
119,382

 
102,668

 
$
46.45

 
 
Awards vested
(159,094
)
 

 
 
 
 
Awards forfeited
(16,110
)
 
(213,639
)
 
 
 
 
Nonvested at December 31, 2014
338,323

 
248,572

 
$
39.62

 
 
 
 
 
 
 
 
 

(1) For Performance Shares, the number of shares is stated at the maximum number that can be attained if the performance conditions are fully met. Forfeitures represent shares forfeited due to vesting below the maximum attainable as a result of the Company not fully meeting the performance conditions.
Schedule of Share-based Compensation, Restricted Stock
Restricted Stock
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Employee
restricted stock
 
Non-employee director
restricted stock
 
Total
restricted stock
 
 
 
Number of
shares
 
Weighted
average grant
date fair 
value
 
Number of
shares
 
Weighted
average grant
date fair 
value
 
Number of
shares
 
Weighted
average grant
date fair 
value
 
 
Nonvested at December 31, 2011
764,761

 
$
53.68

 
39,585

 
$
58.43

 
804,346

 
$
53.91

 
 
Awards granted
226,827

 
72.46

 
16,874

 
71.69

 
243,701

 
72.40

 
 
Awards vested
(337,683
)
 
51.06

 
(20,536
)
 
54.62

 
(358,219
)
 
51.26

 
 
Awards forfeited
(7,157
)
 
53.90

 

 

 
(7,157
)
 
53.90

 
 
Nonvested at December 31, 2012
646,748

 
$
61.63

 
35,923

 
$
66.83

 
682,671

 
$
61.90

 
 
Awards granted
241,071

 
87.85

 
17,162

 
87.40

 
258,233

 
87.82

 
 
Awards vested
(311,334
)
 
55.63

 
(21,599
)
 
66.06

 
(332,933
)
 
56.31

 
 
Awards forfeited
(6,993
)
 
58.14

 

 

 
(6,993
)
 
58.14

 
 
Nonvested at December 31, 2013
569,492

 
$
76.11

 
31,486

 
$
78.57

 
600,978

 
$
76.24

 
 
Awards granted
215,054

 
95.79

 
14,455

 
95.06

 
229,509

 
95.74

 
 
Awards vested
(332,725
)
 
73.74

 
(15,886
)
 
74.96

 
(348,611
)
 
73.79

 
 
Awards forfeited
(99
)
 
55.80

 

 

 
(99
)
 
55.80

 
 
Nonvested at December 31, 2014
451,722

 
$
87.29

 
30,055

 
$
88.41

 
481,777

 
$
87.36