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Share-Based Payments (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Award Activity
The following table summarizes the restricted stock award activity, annually, for the years ended December 31, 2016, 2017 and 2018:
 
Restricted Stock Awards (RSA)
 
Number of
Shares
 
Weighted
Average Grant Date
Fair Value
Outstanding, December 31, 2015
411,409

 
$
6.61

Awarded
648,351

 
7.00

Released
(255,307
)
 
6.68

Forfeited
(608,000
)
 
6.88

Outstanding, December 31, 2016
196,453

 
7.01

Awarded
981,208

 
5.15

Released
(187,224
)
 
7.05

Forfeited
(9,229
)
 
6.32

Outstanding, December 31, 2017
981,208

 
4.12

Awarded
2,164,374

 
1.88

Released
(194,800
)
 
5.14

Forfeited
—

 
—

Outstanding, December 31, 2018
2,950,782

 
2.41
Summary of RSU Award Activity
The following table summarizes the RSU award activity, annually for the years ended December 31, 2017 and 2018:
 
Restricted Stock Units (RSUs)
 
Number of
Shares
 
Weighted
Average Grant Date
Fair Value
Outstanding, December 31, 2016
—

 
$
—

Awarded
1,001,206

 
4.68

Released
—

 
—

Forfeited
(42,014
)
 
4.68

Outstanding, December 31, 2017
959,192

 
4.68

Awarded
357,143

 
1.96

Released
(125,290
)
 
5.15

Forfeited
(138,879
)
 
4.56

Outstanding, December 31, 2018
1,052,166

 
3.72
Total Share-Based Compensation Expense and Related Tax Benefits Recognized
The following table summarizes the total share-based compensation expense and related tax benefits recognized (in thousands):
 
Year Ended December 31,
 
2016
 
2017
 
2018
Share-based compensation expense
$
1,621

 
$
3,112

 
$
2,434