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Stock Incentive Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [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 share awards issued in each respective year.
 
 
 
 
 
 
 
 
Performance Share Awards
 
 
Year ended December 31,
2019
 
2018
 
 
Expected volatility (1)
n/a
 
15.8%
 
 
Expected term (in years)
n/a
 
n/a
 
 
Expected dividend yield
n/a
 
n/a
 
 
Risk-free interest rate (1)
n/a
 
1.85% - 2.36%
 
 
 
 
 
 
 
(1)
The expected volatility and risk-free interest rate applied are specific to each tranche of performance share awards.
Schedule of Share-based Compensation, Options and Premium Option Plan Awards
The following is a summary of activity under the Company’s stock compensation plans.
Stock Options
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted
options
outstanding
 
Weighted
average
exercise price
 
Weighted
average
remaining
contractual
 life
 
Aggregate
intrinsic
value
 
Range of exercise prices
 
 
Balance, December 31, 2016
206,795

 
$
53.17

 
0.9
 
$
17,174

 
$50.71 - $59.66

 
 
Options granted
—

 
—

 
 
 
 
 
—

 
 
Options forfeited
—

 
—

 
 
 
 
 
 
 
 
Options expired
—

 
—

 
 
 
 
 
 
 
 
Options exercised
(174,794
)
 
53.04

 
 
 
$
15,945

 
$50.71 - $59.66
 
 
Balance, December 31, 2017
32,001

 
$
53.86

 
0.2
 
$
2,295

 
$
53.86

 
 
Options granted
—

 
—

 
 
 
 
 
—

 
 
Options forfeited
—

 
—

 
 
 
 
 
 
 
 
Options expired
—

 
—

 
 
 
 
 
 
 
 
Options exercised
(32,001
)
 
53.86

 
 
 
$
2,320

 
$
53.86

 
 
Balance, December 31, 2018
—

 
$
—

 
0.0
 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, Cash Settled Restricted Stock Units and Performance Shares
Cash Settled Restricted Stock Units
 
 
 
 
 
 
Number of
shares
 
 
Nonvested at December 31, 2016
308,344

 
 
Awards granted
98,067

 
 
Awards vested
(122,088
)
 
 
Awards forfeited
(21,993
)
 
 
Nonvested at December 31, 2017
262,330

 
 
Awards granted
—

 
 
Awards vested
(108,344
)
 
 
Awards forfeited
(7,069
)
 
 
Nonvested at December 31, 2018
146,917

 
 
Awards granted
—

 
 
Awards vested
(80,012
)
 
 
Awards forfeited
(3,161
)
 
 
Nonvested at December 31, 2019
63,744

 
 
 
 
 

Performance Share Awards
 
 
 
 
 
 
 
 
Number of
shares (1)
 
Weighted
average 
grant-date fair value
 
 
Nonvested at December 31, 2016
211,381

 
$
44.63

 
 
Awards granted
64,947

 
$
65.27

 
 
Awards vested
(62,499
)
 
$
43.51

 
 
Awards forfeited
(46,156
)
 
 
 
 
Nonvested at December 31, 2017
167,673

 
$
53.11

 
 
Awards granted
83,475

 
$
60.69

 
 
Awards vested
(16,456
)
 
$
53.79

 
 
Awards forfeited
(82,241
)
 
 
 
 
Nonvested at December 31, 2018
152,451

 
$
57.21

 
 
Awards granted
58,050

 
$
146.10

 
 
Awards vested
(21,730
)
 
$
49.90

 
 
Awards forfeited
(43,924
)
 
 
 
 
Nonvested at December 31, 2019
144,847

 
$
94.70

 
 
 
 
 
 
 
(1)
For performance share awards, 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 Awards
Restricted Stock Awards
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Employee
restricted stock awards
 
Non-employee director
restricted stock awards
 
Total
restricted stock awards
 
 
 
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, 2016
402,170

 
$
103.34

 
25,545

 
$
107.95

 
427,715

 
$
103.61

 
 
Awards granted
116,345

 
148.66

 
12,193

 
150.05

 
128,538

 
148.79

 
 
Awards vested
(185,478
)
 
100.17

 
(17,612
)
 
110.66

 
(203,090
)
 
101.08

 
 
Awards forfeited
—

 
—

 
—

 
—

 
—

 
—

 
 
Nonvested at December 31, 2017
333,037

 
$
120.93

 
20,126

 
$
131.09

 
353,163

 
$
121.51

 
 
Awards granted
255,799

 
132.70

 
12,169

 
127.29

 
267,968

 
132.79

 
 
Awards vested
(139,454
)
 
112.70

 
(9,761
)
 
123.59

 
(149,215
)
 
113.41

 
 
Awards forfeited
(1,642
)
 
134.38

 
—

 
—

 
(1,642
)
 
134.38

 
 
Nonvested at December 31, 2018
447,740

 
$
130.37

 
22,534

 
$
132.29

 
470,274

 
$
130.46

 
 
Awards granted
242,832

 
146.92

 
11,444

 
147.43

 
254,276

 
146.94

 
 
Awards vested
(165,245
)
 
124.71

 
(12,972
)
 
131.88

 
(178,217
)
 
125.23

 
 
Awards forfeited
(14,467
)
 
136.16

 
—

 
—

 
(14,467
)
 
136.16

 
 
Nonvested at December 31, 2019
510,860

 
$
139.91

 
21,006

 
$
140.79

 
531,866

 
$
139.94