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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of stock option activity for the years ended December 31, 2018, 2017 and 2016 is as follows (in thousands, except per share amounts):
 
Outstanding
Options
 
Weighted-
Average 
Exercise Price
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2015
4,060

 
$
8.37

 
$
2,760

Granted
1,348

 
8.15

 
—

Exercised
(420
)
 
6.27

 
4,455

Forfeited
(227
)
 
10.20

 
—

 


 


 


Outstanding at December 31, 2016
4,761

 
8.40

 
8,655

Granted
568

 
10.73

 
—

Exercised
(428
)
 
7.85

 
1,300

Forfeited
(467
)
 
10.39

 
539

 


 


 


Outstanding at December 31, 2017
4,434

 
8.57

 
9,340

Granted
912

 
8.20

 
—

Exercised
(662
)
 
5.33

 
967

Forfeited
(573
)
 
11.21

 
—

 
 
 
 
 
 
Outstanding at December 31, 2018
4,111

 
$
8.53

 
$
37

 


 


 


Options vested and exercisable at December 31, 2018
2,030

 
$
8.68

 
$
37
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The following table summarizes information about all stock options outstanding for the Company as of December 31, 2018 (share amounts in thousands): 
Options Outstanding
 
Options Vested
Exercise Price
Number
Outstanding
 
Weighted-Average Life Remaining (Years)
 
Weighted-
Average
Exercise Price
 
Number
Exercisable
 
Weighted-
Average
Exercise Price
$0.00 - $4.36
27

 
0.15
 
$
2.36

 
27

 
$
2.36

$4.37 - $7.95
2,145

 
6.83
 
$
7.19

 
924

 
$
6.82

$7.96 - $11.97
1,621

 
6.68
 
$
9.47

 
762

 
$
9.25

$11.98 - $15.05
318

 
3.63
 
$
13.28

 
318

 
$
13.28


4,111

 
6.48
 
$
8.53

 
2,030

 
$
8.68

The weighted-average fair values and ranges of exercise prices for stock options granted during the years ended December 31, 2018, 2017 and 2016, which vest ratably over four or five years, are as follows (in thousands, except per share amounts):
 
Options Granted
 
Weighted-Average
Fair Value
 
Exercise Prices
2016
1,348

 
$
3.38

 
$6.99 - $9.20
2017
568

 
$
4.42

 
$9.32 - $11.47
2018
912

 
$
3.37

 
$7.56 - $9.49
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following assumptions were utilized in the Black-Scholes valuation model for options granted in 2018, 2017 and 2016:
 
2018
 
2017
 
2016
Dividend yield
—

 
—

 
—

Risk-free interest rate
2.76%-3.15%

 
1.98%-2.34%

 
1.53%-2.03%

Expected life
6.4 years

 
6.5 years

 
6.5 years

Volatility
35.0%-36.2%

 
36.0%-38.0%

 
38.0%-50.0%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of restricted share activity is as follows (in thousands, except per share amounts):
 
Outstanding 
Restricted
Common Shares
 
Weighted-
Average Grant-
Date Fair Value
Nonvested Restricted Common shares at December 31, 2015
957


$
7.66

Granted
559


$
8.24

Vested and transferred to unrestricted common stock
(429
)

$
7.71

Forfeited
(78
)

$
8.04

 





Nonvested Restricted Common shares at December 31, 2016
1,009


$
7.92

Granted
332


$
11.00

Vested and transferred to unrestricted common stock
(403
)

$
8.28

Forfeited
(166
)

$
8.51

 





Nonvested Restricted Common shares at December 31, 2017
772


$
8.98

Granted
84


$
9.37

Vested and transferred to unrestricted common stock
(341
)

$
8.83

Forfeited
(68
)

$
9.29

Nonvested Restricted Common shares at December 31, 2018
447


$
9.13

A summary of restricted share unit activity is as follows (in thousands, excepts per share amounts):
 
Outstanding Restricted Share Units
 
Weighted- Average Grant- Date Fair Value
Nonvested Restricted Share Units at December 31, 2017
—

 
$
—

Granted
577

 
$
7.74

Vested and transferred to unrestricted share units
(16
)
 
$
7.75

Forfeited
(9
)
 
$
7.75

Nonvested Restricted Share Units at December 31, 2018
552

 
$
7.74
Schedule of Nonvested Performance-based Units Activity
 
Outstanding 
Performance Share Units

Weighted-
Average Grant-
Date Fair Value
Nonvested Performance Share Units at December 31, 2016
—

 
$
—

Granted
152

 
$
11.10

Forfeited
(24
)
 
$
11.10

Nonvested Performance Share Units at December 31, 2017
128

 
$
11.10

Granted
187

 
$
7.36

Forfeited
(22
)
 
$
11.10

Nonvested Performance Share Units at December 31, 2018
293

 
$
8.72