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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Schedule of Nonvested Share Activity
The following table summarizes the restricted stock award, deferred stock units, and performance unit award activity for the period ended March 31, 2018:
 
 
Restricted
Stock
 
Deferred
Stock Units
 
Performance
Stock Units
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2017
 
186,806

 
26,860

 
181,341

 
$
16.53

Granted
 
47,905

 
2,230

 
62,714

 
27.02

Vested
 
(35,946
)
 
—

 
—

 
28.27

Adjustment for incentive awards expected to vest
 
—

 
—

 
(2,406
)
 
15.68

Cancelled and forfeited
 
(14,425
)
 
—

 
(11,880
)
 
15.60

Outstanding at March 31, 2018
 
184,340

 
29,090

 
229,769

 
$
18.43