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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
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 2018, 2017, and 2016:

 
 
2018
 
2017
 
2016
Volatility
 
25.1% to 33.2%
 
23.0% to 26.4%
 
22.2% to 26.2%
Risk free interest rate
 
2.1% to 2.9%
 
1.5% to 2.0%
 
0.9% to 1.9%
Expected life in years
 
3.0 to 5.0
 
3.0 to 5.0
 
3.0 to 5.0
Dividend yield
 
1.7%
 
0.0%
 
0.0%
Weighted average fair value
 
$6.75
 
$5.94
 
$4.74
Schedule Of Share Based Compensation Shares Authorized Under Stock Plans Issued And Avaliability
The following table summarizes the number of shares of common stock authorized for use under the Plan, the number of stock-based awards granted (net of expired or cancelled awards) under the Plan and the number of shares of common stock available for the grant of stock-based awards under the Plan:


Common stock authorized
35,199,000

Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled
(34,131,866
)
Common stock available for grant of stock-based awards as of December 31, 2018
1,067,134

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
For the years ended December 31, 2018, 2017 and 2016, total equity-based compensation was as follows:  

 
Years Ended December 31,
 
2018
 
2017
 
2016
Restricted stock
$
16,720

 
$
16,616

 
$
16,494

Stock options
4,356

 
4,231

 
3,015

Total
$
21,076

 
$
20,847

 
$
19,509

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, 2018 is as follows:

 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2016
 
3,024,000

 
$
15.67

 
 
 
 

Granted
 
393,000

 
22.57

 
 
 
 

Exercised
 
(1,119,000
)
 
9.57

 
 
 
 

Forfeited
 
(49,000
)
 
20.39

 
 
 
 

Outstanding at December 31, 2016
 
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

 
4.7
 
$
11,911

Exercisable at December 31, 2018
 
1,164,000

 
$
25.27

 
3.8
 
$
5,813

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, 2018:

 
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
$17.97 to $21.97
164,000

 
1.9
 
$20.11
 
127,000

 
$20.02
$21.98 to $25.98
1,806,000

 
4.5
 
24.40
 
679,000

 
23.94
$25.99 to $29.99
532,000

 
5.7
 
28.08
 
245,000

 
26.77
$30.00 to $34.00
52,000

 
6.6
 
30.88
 

 
$34.01 to $38.01
261,000

 
4.7
 
35.85
 
113,000

 
35.95
 
2,815,000

 
4.7
 
$26.03
 
1,164,000

 
$25.27
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three years ended December 31, 2018:

 
 
Number of Shares
 
Weighted Average Fair Value at Grant Date
Outstanding at January 1, 2016
 
6,083,000

 
$
16.88

Granted
 
651,000

 
22.87

Vested
 
(414,000
)
 
20.19

Forfeited
 
(33,000
)
 
22.30

Outstanding at December 31, 2016
 
6,287,000

 
17.29

Granted
 
413,000

 
25.11

Vested
 
(762,000
)
 
20.39

Forfeited
 
(64,000
)
 
23.65

Outstanding at December 31, 2017
 
5,874,000

 
17.37

Granted
 
509,000

 
31.70

Vested
 
(1,177,000
)
 
18.44

Forfeited
 
(71,000
)
 
25.61

Outstanding at December 31, 2018
 
5,135,000

 
$
18.42

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, 2018, 2017, 2016 are as follows:

 
Years Ended December 31,
 
2018
 
2017
 
2016
Proceeds from stock options exercised
$
13,036

 
$
16,433

 
$
10,713

Intrinsic value of stock options exercised
$
6,841

 
$
9,936

 
$
16,983