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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Summary of Stock Option Activity
A summary of the status of stock options and related activity for the years ended December 31, 2017, 2016 and 2015 is presented below:
 
Shares
 
Weighted
Average
Exercise Price
per Share
 
Weighted
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value (In thousands)
Options outstanding at January 1, 2015
5,000

 
$
9.07

 
0.69

 
$
163

Granted
—

 
—

 
 
 
 
Exercised
(5,000
)
 
9.07

 
 
 
124

Forfeited/expired
—

 
—

 
 
 
 
Options outstanding at December 31, 2015
—

 
—

 
—

 
$
—

Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
—

Forfeited/expired
—

 
—

 
 
 
 
Options outstanding at December 31, 2016
—

 
—

 
—

 
$
—

Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
—

Forfeited/expired
—

 
—

 
 
 
 
Options outstanding at December 31, 2017
—

 
$
—

 
—

 
$
—

Options exercisable at December 31, 2017
—

 
$
—

 
—

 
$
—
Summary of Restricted Stock Award and Unit Activity
The following table summarizes restricted stock activity for the twelve months ended December 31, 2017, 2016 and 2015: 
 
Number of
Unvested
Restricted Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested shares as of January 1, 2015
387,245

 
$
55.87

Granted
352,605

 
35.99

Vested
(236,812
)
 
52.39

Forfeited
(18,799
)
 
45.21

Unvested shares as of December 31, 2015
484,239

 
$
43.51

Granted
451,241

 
$
27.78

Vested
(252,566
)
 
43.94

Forfeited
(69,858
)
 
33.43

Unvested shares as of December 31, 2016
613,056

 
$
32.90

Granted
876,846

 
$
15.14

Vested
(423,977
)
 
29.90

Forfeited
(89,898
)
 
27.91

Unvested shares as of December 31, 2017
976,027

 
$
18.71