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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of option activity under the Omnibus Plan as of December 31, 2018 and changes during the year then ended is presented below: 
 
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at beginning of year
 
1,477,626

 
$
78.04

 
 
 
 
Granted
 
361,543

 
69.59

 
 
 
 
Exercised
 
(98,014
)
 
73.12

 
 
 
 
Expired
 
(155,934
)
 
92.37

 
 
 
 
Forfeited
 
(37,591
)
 
68.87

 
 
 
 
Outstanding at end of year
 
1,547,630

 
$
75.15

 
2.9
 
$
7,639

Exercisable at end of year
 
873,741

 
$
79.95

 
1.6
 
$
4,180

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following weighted average assumptions were used to estimate the grant date fair value of options granted during the years ended December 31, 2018, 2017 and 2016 using the Black-Scholes option pricing model: 
 
 
2018
 
2017
 
2016
Expected volatility
 
27
%
 
30
%
 
37
%
Expected term (in years)
 
5.5

 
4

 
4

Risk-free interest rate
 
2.69
%
 
1.69
%
 
1.08
%
Expected dividend yield
 
0
%
 
0
%
 
0
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the Company's non-vested restricted stock activity as of December 31, 2018 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
289,016

 
$
64.74

Granted
 
80,400

 
$
70.56

Vested
 
(89,346
)
 
$
67.41

Forfeited
 
(13,976
)
 
$
64.96

Non-vested at end of year
 
266,094

 
$
65.59

Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the Company's non-vested restricted stock units activity as of December 31, 2018 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
54,838

 
$
66.72

Granted
 
33,925

 
$
70.35

Vested
 
(27,682
)
 
$
66.16

Forfeited
 
(4,344
)
 
$
67.53

Non-vested at end of year
 
56,737

 
$
69.10

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table presents the total compensation costs, total income tax benefit recognized in the consolidated statement of operations for stock-based awards and total tax benefit realized from exercise of stock-based awards for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
 
 
2018
 
2017
 
2016
Compensation costs
 
$
17,634

 
$
17,477

 
$
17,888

Income tax benefit recognized for compensation costs
 
$
3,437

 
$
3,430

 
$
5,296

Income tax benefit realized from exercise of stock-based awards
 
$
1,729

 
$
3,136

 
$
2,135

Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block]
The Company’s non-management directors can elect to defer their director compensation that would otherwise be payable in cash and receive payments for fees earned in the form of deferred stock units representing shares of the Company’s Class A Common Stock, with a value equal to 125% of the cash fees earned. The Company’s deferred stock units are deemed vested on the grant date. The following table summarizes the Company’s deferred stock unit activity as of December 31, 2018 and changes during the year then ended:
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at beginning of year
 
93,979

 
$
51.71

Granted
 
11,185

 
$
78.33

Issued
 
(30,384
)
 
$
53.78

Outstanding at end of year
 
74,780

 
$
54.85

Performance Shares Current Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes the 2018 and 2017 performance-based restricted stock unit activity as of December 31, 2018 and changes during the year then ended:
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
31,611

 
$
74.14

Granted
 
39,663

 
$
69.53

Vested
 
(10,542
)
 
$
74.14

Forfeited
 
(1,084
)
 
$
71.27

Non-vested at end of year
 
59,648

 
$
71.13

Performance Shares - 2015 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes the 2015 performance-based restricted stock units activity as of December 31, 2018 and changes during the year then ended. Based on the market condition criteria for the 2015 performance-based restricted stock units awarded, the threshold performance for any payout had not been met, and no shares were paid out at February 1, 2018 (the end of the performance period).
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
14,386

 
$
62.73

Granted
 

 
$

Vested
 

 
$

Forfeited/Canceled
 
(14,386
)
 
$
62.73

Non-vested at end of year
 

 
$