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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The following weighted average assumptions were used for stock options granted during 2019, 2018 and 2017:

 
2019
 
2018
 
2017
Volatility
32.0% to 39.6%
 
25.1% to 33.2%
 
23.0% to 26.4%
Risk free interest rate
1.6% to 2.5%
 
2.1% to 2.9%
 
1.5% to 2.0%
Expected life in years
1.0 to 5.0
 
3.0 to 5.0
 
3.0 to 5.0
Dividend yield
1.6%
 
1.7%
 
0.0%
Weighted average fair value
$5.38
 
$6.75
 
$5.94



Schedule Of Share Based Compensation Shares Authorized Under Stock Plans Issued And Avaliability

Common stock authorized
11,000,000

Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled awards
(483,185
)
Common stock available for grant of stock-based awards as of December 31, 2019
10,516,815


Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

For the years ended December 31, 2019, 2018 and 2017, total equity-based compensation was as follows:

 
Years Ended December 31,
 
2019
 
2018
 
2017
Restricted stock
$
19,143

 
$
16,720

 
$
16,616

Stock options
4,027

 
4,356

 
4,231

Total
$
23,170

 
$
21,076

 
$
20,847


Schedule of Share-based Compensation, Stock Options, Activity
Activity relating to stock options granted under the Company’s plans and outside the plans during the three years ended December 31, 2019 is as follows:

 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2017
2,249,000

 
$
19.81

 
 
 
 
Granted
1,593,000

 
25.03

 
 
 
 
Exercised
(983,000
)
 
16.49

 
 
 
 
Forfeited
(13,000
)
 
23.49

 
 
 
 
Outstanding at December 31, 2017
2,846,000

 
23.87

 
 
 
 
Granted
585,000

 
32.39

 
 
 
 
Exercised
(593,000
)
 
22.04

 
 
 
 
Forfeited
(23,000
)
 
22.59

 
 
 
 
Outstanding at December 31, 2018
2,815,000

 
26.03

 
 
 
 
Granted
272,000

 
30.93

 
 
 
 
Exercised
(273,000
)
 
22.77

 
 
 
 
Forfeited
(12,000
)
 
20.17

 
 
 
 
Outstanding at December 31, 2019
2,802,000

 
$
26.85

 
4.1
 
$
45,284

Exercisable at December 31, 2019
1,630,000

 
$
27.02

 
3.7
 
$
26,069


Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about stock options at December 31, 2019:

 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
Number Outstanding
 
Weighted Average Remaining Contractual Life (in Years)
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Exercise Price
$19.59 to $23.91
468,000

 
2.2
 
$22.79
 
347,000

 
$22.54
$23.92 to $28.24
1,474,000

 
4.1
 
25.18
 
775,000

 
25.43
$28.25 to $32.57
557,000

 
5.7
 
29.81
 
275,000

 
29.58
$32.58 to $36.90
291,000

 
3.9
 
35.55
 
233,000

 
35.93
$36.91 to $41.23
12,000

 
6.5
 
41.18
 

 
 
2,802,000

 
4.1
 
$26.85
 
1,630,000

 
$27.02



Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three years ended December 31, 2019:

 
Number of Shares
 
Weighted Average Fair Value at Grant Date
Outstanding at January 1, 2017
6,287,000

 
$
17.29

Granted
413,000

 
25.11

Vested
(762,000
)
 
20.39

Forfeited
(62,000
)
 
23.65

Outstanding at December 31, 2017
5,876,000

 
17.37

Granted
509,000

 
31.70

Vested
(1,177,000
)
 
18.44

Forfeited
(71,000
)
 
25.61

Outstanding at December 31, 2018
5,137,000

 
18.42

Granted
633,000

 
32.64

Vested
(1,200,000
)
 
19.40

Forfeited
(143,000
)
 
28.61

Outstanding at December 31, 2019
4,427,000

 
$
19.84


Schedule of cash proceeds and intrinsic values for stock options exercised table text block
Stock Options

Cash proceeds and intrinsic values related to total stock options exercised during December 31, 2019, 2018 and 2017 are as follows:

 
Years Ended December 31,
 
2019
 
2018
 
2017
Proceeds from stock options exercised
$
6,212

 
$
13,036

 
$
16,433

Intrinsic value of stock options exercised
$
4,268

 
$
6,841

 
$
9,936