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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 is as follows (in thousands, except per share amounts):
 
Outstanding
Options
 
Weighted-
Average 
Exercise Price
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2014
4,046

 
$
8.35

 
$
4,725

Granted
975

 
6.87

 
—

Exercised
(405
)
 
2.95

 
1,604

Forfeited
(556
)
 
9.58

 
—

 


 


 


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

 


 


 


Options vested and exercisable at December 31, 2017
2,505

 
$
8.62

 
$
5,860
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, 2017 (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
64

 
1.29
 
$
3.11

 
64

 
$
3.11

$4.37 - $7.95
2,189

 
5.23
 
$
6.68

 
1,320

 
$
6.43

$7.96 - $11.97
1,613

 
7.50
 
$
9.55

 
552

 
$
9.32

$11.98 - $15.05
568

 
2.94
 
$
13.65

 
568

 
$
13.65


4,434

 
5.70
 
$
8.57

 
2,505

 
$
8.62

The weighted-average fair values and ranges of exercise prices for stock options granted during the years ended December 31, 2017, 2016 and 2015, 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
2015
975

 
$
3.39

 
$6.21 - $8.20
2016
1,348

 
$
3.38

 
$6.99 - $9.20
2017
568

 
$
4.42

 
$9.32 - $11.47
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 2017, 2016 and 2015:
 
2017
 
2016
 
2015
Dividend yield
—

 
—

 
—

Risk-free interest rate
1.98%-2.34%

 
1.53%-2.03%

 
1.92%-2.12%

Expected life
6.5 years

 
6.5 years

 
6 years

Volatility
36.0%-38.0%

 
38.0%-50.0%

 
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, 2014
1,090


$
8.92

Granted
688


6.90

Vested and transferred to unrestricted common stock
(465
)

8.40

Forfeited
(356
)

8.19

 





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
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
151,822


11.10

Forfeited
(23,588
)

11.10

Nonvested Performance Share Units at December 31, 2017
128,234


$
11.10