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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Stock Options
For the period June 1 - September 30, 2019
 
Number of Shares
(in thousands)
Weighted Average Exercise Price (per share)
Weighted Average Remaining Contractual Term (in years)
Aggregate Intrinsic Value
(in thousands)
Outstanding at June 1, 2019
10,468

$
32.11

 
 
Exercised
(178
)
21.23

 
 
Forfeited/Expired
(36
)
38.26

 
 
Outstanding at September 30, 2019
10,254

$
32.28

4.90
$
15,855

Exercisable at September 30, 2019
8,215

$
30.32

4.12
$
14,868
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]
 
For the period June 1 - September 30, 2019
 
Number of Shares
(in thousands)
Weighted Average Grant Date Fair Value
(per share)
Nonvested at June 1, 2019
3,757

$
35.56

Granted
2,228

28.88

Vested
(374
)
39.22

Forfeited
(35
)
36.10

Nonvested at September 30, 2019
5,576

$
32.66