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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Stock options activity
The following is a summary of stock option activity for the years ended December 31, 2019, 2018, and 2017 (options in thousands):
 
Number of
Options
 
Weighted Average
Exercise Price Per Option
Outstanding at December 31, 2016
565

 
$
43.28

Exercised
(144
)
 
30.04

Forfeited/Expired
(189
)
 
73.88

Outstanding at December 31, 2017
232

 
26.36

Exercised
(114
)
 
26.40

Forfeited/Expired
(4
)
 
74.88

Outstanding at December 31, 2018
114

 
24.00

Exercised
(42
)
 
25.59

Forfeited/Expired
(5
)
 
25.32

Outstanding at December 31, 2019
67

 
$
23.13

Options Exercisable at December 31, 2019
67

 
$
23.13
Summary of restricted stock activity The following table summarizes restricted stock activity for the years ended December 31, 2019, 2018, and 2017 (shares in thousands):
 
Number of
Shares
 
Weighted-Average Grant Date
Fair Value
Non-vested restricted stock at December 31, 2016
117

 
$
30.28

Granted
77

 
34.52

Vested
(53
)
 
30.00

Forfeited
(2
)
 
26.12

Non-vested restricted stock at December 31, 2017
139

 
31.72

Granted
78

 
34.04

Vested
(64
)
 
31.32

Forfeited
(5
)
 
32.88

Non-vested restricted stock at December 31, 2018
148

 
33.08

Granted
66

 
35.64

Vested
(72
)
 
34.09

Forfeited
(1
)
 
34.46

Non-vested restricted stock at December 31, 2019
141

 
$
34.81
Summary of all performance-based RSU activity
The following table summarizes the performance-based RSU activity for the years ended December 31, 2019, 2018, and 2017 (in thousands):
Outstanding at December 31, 2016
318

Granted
100

Vested
(144
)
Forfeited
(3
)
Outstanding at December 31, 2017
271

Granted
113

Vested
(75
)
Forfeited
(9
)
Outstanding at December 31, 2018
300

Granted
93

Vested
(94
)
Forfeited
(1
)
Outstanding at December 31, 2019
298