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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following table summarizes our restricted stock activity (in thousands, except per share amounts):
 
Shares
 
Weighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2018
526

 
$
17.29

Granted
295

 
17.43

Vested
(213
)
 
17.31

Forfeited
(70
)
 
16.64

Unvested balance at December 31, 2019
538

 
$
16.95


The following table summarizes our performance restricted stock activity (in thousands, except per unit amounts):
 
Units
 
Weighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2018
101

 
$
16.14

Granted
48

 
17.00

Vested
—

 
—

Forfeited
(3
)
 
17.34

Unvested balance at December 31, 2019
146

 
$
16.33
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table summarizes our compensation costs recognized in General and administrative expense (excluding depreciation) and Operating expense (excluding depreciation) under the Incentive Plan and Stock Purchase Plan (in thousands):
 
Years Ended December 31,
 
2019
 
2018
 
2017
Restricted Stock Awards
$
3,490

 
$
3,483

 
$
4,263

Restricted Stock Units
$
1,269

 
$
835

 
$
502

Stock Option Awards
$
1,454

 
$
1,878

 
$
2,439
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value The weighted-average assumptions used to measure stock options granted during 2019, 2018, and 2017 are presented below.
 
2019
 
2018
 
2017
Expected life from date of grant (years)
5.3
 
5.3
 
5.3
Expected volatility
34.3%
 
36.2%
 
42.0%
Risk-free interest rate
2.46%
 
2.50%
 
1.97%
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes our stock option activity (in thousands, except per share amounts and term years):
 
Number of Options
 
Weighted-Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual
Term in Years
 
Aggregate
Intrinsic
Value
Outstanding balance at December 31, 2018
2,231

 
$
19.27

 
4.8
 
$
—

Issued
300

 
17.00

 
 
 
 
Exercised
(483
)
 
17.78

 
 
 
 
Forfeited / canceled
(18
)
 
17.00

 
 
 
 
Outstanding balance at December 31, 2019
2,030

 
$
19.31

 
4.7
 
$
7,981

Exercisable, end of year
1,275

 
$
20.25

 
3.6
 
$
3,816