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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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.
 
Nine Months Ended
 
September 30, 2017
 
September 30, 2016
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
1,040,569

 
$
9.97

 
1,157,659

 
$
7.52

Granted
243,940

 
17.52

 
294,060

 
15.43

Converted
(173,210
)
 
9.69

 
(160,500
)
 
7.20

Expired
—

 
—

 
—

 
—

Forfeited
(3,800
)
 
13.66

 
(9,200
)
 
10.23

Outstanding at end of period
1,107,499

 
$
11.66

 
1,282,019

 
$
9.36

Vested
324,599

 
$
6.39

 
338,919

 
$
6.12