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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
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,
| 2018 |  | 2017 |  | 2016
Restricted Stock Awards | $ | 3,483 |  |  | $ | 4,263 |  |  | $ | 2,975 |
Restricted Stock Units | $ | 835 |  |  | $ | 502 |  |  | $ | 1,255 |
Stock Option Awards | $ | 1,878 |  |  | $ | 2,439 |  |  | $ | 2,352 |
Schedule Of Equity Incentive Plan Disclosures | The following table summarizes our restricted stock activity, including performance restricted stock units, (in thousands, except per share amounts):
| Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at December 31, 2017 | 543 |  |  | $ | 16.23 |
Granted | 309 |  |  | $ | 17.45 |
Vested | (184 | ) |  | $ | 17.62 |
Forfeited | (41 | ) |  | $ | 17.39 |
Unvested balance at December 31, 2018 | 627 |  |  | $ | 17.14 |
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 2018, 2017, and 2016 are presented below.
| 2018 |  | 2017 |  | 2016
Expected life from date of grant (years) | 5.3 |  | 5.3 |  | 4.4
Expected volatility | 36.2% |  | 42.0% |  | 39.8%
Expected dividend yield | —% |  | —% |  | —%
Risk-free interest rate | 2.50% |  | 1.97% |  | 1.16%
Schedule of Share-based Compensation, Stock Options, Activity | The following table summarizes our stock option activity (in thousands, except per share amounts):
| Number of Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term in Years |  | Aggregate Intrinsic Value
Outstanding balance at December 31, 2017 | 1,979 |  |  | $ | 19.52 |  |  | 5.5 |  | $ | 1,431 |
Issued | 252 |  |  | 17.34 |  |  |  |  |
Outstanding balance at December 31, 2018 | 2,231 |  |  | $ | 19.27 |  |  | 4.8 |  | $ | — |
Exercisable, end of year | 1,440 |  |  | $ | 19.66 |  |  | 3.8 |  | $ | — |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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