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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity
The table below summarizes award activity.
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
873,849

 
$
12.30

 
1,040,569

 
$
9.97

Granted
207,295

 
26.50

 
243,940

 
17.52

Converted
(96,616
)
 
10.89

 
(173,210
)
 
9.69

Expired
(500
)
 
28.38

 
—

 
—

Forfeited
(2,600
)
 
26.76

 
(3,800
)
 
13.66

Outstanding at end of period
981,428

 
$
15.39

 
1,107,499

 
$
11.66

Vested
326,928

 
$
7.18

 
324,599

 
$
6.39