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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Expense
The following table discloses the amount of stock-based compensation expense:
 
Three Months Ended
March 31,
 
2017
 
2016
Stock options
$
14

 
$
431

Restricted stock units
700

 
1,823

Performance stock units
569

 
2,498

Total stock-based compensation
$
1,283

 
$
4,752
Details of Stock Options Activity
The following table provides details of the stock option activity for the three months ended March 31, 2017:
 
Number of Shares
Outstanding at December 31, 2016
495,704

Exercised
(175,779
)
Expired
—

Canceled
—

Outstanding at March 31, 2017
319,925

Exercisable
319,925
Details of Nonvested Restricted Stock Units Activity
The following table provides details of the nonvested restricted stock unit activity for the three months ended March 31, 2017:
 
Number of Restricted Stock Units
Nonvested at December 31, 2016
240,574

Granted
94,207

Vested
(117,198
)
Canceled
(1,218
)
Accrued dividend equivalents
573

Nonvested at March 31, 2017
216,938
Performance Stock Units Earned under Long-Term Incentive Plan
The following table provides details of the nonvested performance stock units under the Company’s Long-Term Incentive Plan:
 
Number of Performance Stock Units
Performance stock units outstanding at December 31, 2016
163,967

Granted
64,208

Canceled
(1,745
)
Accrued dividend equivalents
433

Performance stock units outstanding at March 31, 2017
226,863