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Stock Incentive Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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,
2017
 
2016
 
 
Expected volatility (1)
14.3%
 
14.3% - 14.7%
 
 
Expected term (in years)
n/a
 
n/a
 
 
Expected dividend yield
n/a
 
n/a
 
 
Risk-free interest rate (1)
0.93% - 1.69%
 
0.38% - 1.18%
 
 
 
 
 
 
 
(1)
The expected volatility and risk-free interest rate applied are specific to each tranche of performance shares.
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.
Options
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted
options
outstanding
 
Weighted
average
exercise price
 
Weighted
average
remaining
contractual
 life
 
Aggregate
intrinsic
value
 
Range of exercise prices
 
 
Balance, December 31, 2014
767,830

 
$
48.71

 
2.0
 
$
37,246

 
$37.51 - $59.66

 
 
Options granted
—

 
—

 
 
 
 
 
—

 
 
Options forfeited
—

 
—

 
 
 
 
 
 
 
 
Options expired
—

 
—

 
 
 
 
 
 
 
 
Options exercised
(359,618
)
 
45.09

 
 
 
$
21,205

 
 
 
 
Balance, December 31, 2015
408,212

 
$
51.90

 
1.6
 
$
25,020

 
$42.66 - $59.66

 
 
Options granted
—

 
—

 
 
 
 
 
—

 
 
Options forfeited
—

 
—

 
 
 
 
 
 
 
 
Options expired
—

 
—

 
 
 
 
 
 
 
 
Options exercised
(201,417
)
 
50.59

 
 
 
$
14,806

 
 
 
 
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

 
 
 
 
Balance, December 31, 2017
32,001

 
$
53.86

 
0.2
 
$
2,295

 
$
53.86

 
 
Total options exercisable at December 31, 2017
32,001

 
$
53.86

 
0.2
 
$
2,295

 
$
53.86

 
 
 
 
 
 
 
 
 
 
 
 
 
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, 2014
338,323

 
 
Awards granted
160,817

 
 
Awards vested
(144,440
)
 
 
Awards forfeited
(28,622
)
 
 
Nonvested at December 31, 2015
326,078

 
 
Awards granted
135,119

 
 
Awards vested
(133,278
)
 
 
Awards forfeited
(19,575
)
 
 
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

 
 
 
 
 

Performance Shares
 
 
 
 
 
 
 
 
Number of
shares (1)
 
Weighted
average 
grant-date fair value
 
 
Nonvested at December 31, 2014
248,572

 
$
39.62

 
 
Awards granted
103,024

 
$
44.98

 
 
Awards vested
—

 
 
 
 
Awards forfeited
(121,325
)
 
 
 
 
Nonvested at December 31, 2015
230,271

 
$
41.40

 
 
Awards granted
77,045

 
$
48.31

 
 
Awards vested
(58,032
)
 
$
38.30

 
 
Awards forfeited
(37,903
)
 
 
 
 
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

 
 
 
 
 
 
 
(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 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, 2014
451,722

 
$
87.29

 
30,055

 
$
88.41

 
481,777

 
$
87.36

 
 
Awards granted
195,337

 
102.17

 
14,575

 
102.90

 
209,912

 
102.22

 
 
Awards vested
(168,019
)
 
82.75

 
(17,744
)
 
86.37

 
(185,763
)
 
83.10

 
 
Awards forfeited
—

 
—

 
—

 
—

 
—

 
—

 
 
Nonvested at December 31, 2015
479,040

 
$
94.95

 
26,886

 
$
97.61

 
505,926

 
$
95.09

 
 
Awards granted
179,003

 
112.41

 
14,727

 
114.71

 
193,730

 
112.59

 
 
Awards vested
(255,873
)
 
93.98

 
(16,068
)
 
96.83

 
(271,941
)
 
94.15

 
 
Awards forfeited
—

 
—

 
—

 
—

 
—

 
—

 
 
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