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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock awards and performance stock awards activity issued under the 2014 Plan for the year ended December 31, 2017:
 
Restricted Stock Awards
 
Performance Stock Awards
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of Target
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested restricted stock awards, January 1, 2017
532,294

 
$
9.98

 
332,092

 
$
11.73

Granted
323,503

 
$
13.70

 
181,067

 
$
14.36

Vested
(292,615
)
 
$
8.64

 
(124,568
)
 
$
11.86

Forfeited
(47,581
)
 
$
10.41

 
(131,016
)
 
$
11.78

Unvested restricted stock awards, December 31, 2017
515,601

 
$
13.03

 
257,575

 
$
13.49
Stock Options and Stock Appreciation Rights Granted and Exercised
The following table represents information about stock options and stock appreciation rights exercised in each year.
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(amounts in thousands)
Total intrinsic value of options exercised
$
516

 
$
1,323

 
$
1,610
Summary of Share Option Plans Activities
The following table summarizes the Company’s activities with respect to all of its share option plans (issued under the 2014 Plan and the 1999 Plan) for the year ended December 31, 2017: 
 
Number of Shares
 
Option Price
 
Weighted
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life (in years)
 
Aggregate
Intrinsic
Value (amounts in thousands)
Share options outstanding, January 1, 2017
188,213

 
$4.16-$22.50
 
$5.72
 
 
 
 
Granted
—

 
—
 
—
 
 
 
 
Exercised
(74,625
)
 
$4.35-$8.09
 
$5.71
 
 
 
 
Forfeited/expired
(19,088
)
 
$5.21-$22.50
 
$8.43
 
 
 
 
Share options outstanding and exercisable, December 31, 2017
94,500

 
$4.16-$7.44
 
$5.19
 
1.85
 
$
716