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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Stock options
$
—

 
$
27

 
$
14

 
$
458

Restricted stock units
1,082

 
1,946

 
1,782

 
3,769

Performance stock units
210

 
2,974

 
779

 
5,472

Total stock-based compensation
$
1,292

 
$
4,947

 
$
2,575

 
$
9,699
Details of Stock Options Activity
The following table provides details of the stock option activity for the six months ended June 30, 2017:
 
Number of Shares
Outstanding at December 31, 2016
495,704

Exercised
(204,384
)
Expired
—

Canceled
—

Outstanding at June 30, 2017
291,320

Exercisable
291,320
Details of Nonvested Restricted Stock Units Activity
The following table provides details of the nonvested restricted stock unit activity for the six months ended June 30, 2017:
 
Number of Restricted Stock Units
Nonvested at December 31, 2016
240,574

Granted
94,707

Vested
(117,198
)
Canceled
(7,829
)
Accrued dividend equivalents
1,293

Nonvested at June 30, 2017
211,547
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
(6,807
)
Accrued dividend equivalents
942

Performance stock units outstanding at June 30, 2017
222,310