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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock Options
For the period June 1 - June 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

 
 
Forfeited/Expired
(12
)
40.02

 
 
Outstanding at June 30, 2019
10,456

$
32.10

5.08
$
23,343

Exercisable at June 30, 2019
8,293

$
30.18

4.24
$
21,315
Schedule of Other Share-based Compensation, Activity [Table Text Block]
 
For the period June 1 - June 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
80

25.03

Forfeited
(3
)
38.78

Nonvested at June 30, 2019
3,834

$
35.34