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Stockholders' Equity (Tables) | 12 Months Ended
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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 |

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