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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Restricted Stock Awards | $ | 4,263 |  |  | $ | 2,975 |  |  | $ | 3,692 |
Restricted Stock Units | $ | 502 |  |  | $ | 1,255 |  |  | $ | — |
Stock Option Awards | $ | 2,439 |  |  | $ | 2,352 |  |  | $ | 1,477 |
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, 2016 | 436 |  |  | $ | 17.83 |
Granted | 323 |  |  | $ | 15.25 |
Vested | (207 | ) |  | $ | 18.77 |
Forfeited | (9 | ) |  | $ | 16.44 |
Unvested balance at December 31, 2017 | 543 |  |  | $ | 16.23 |
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 2017, 2016, and 2015 are presented below.
| 2017 |  | 2016 |  | 2015
Expected life from date of grant (years) | 5.3 |  | 4.4 |  | 6.4
Expected volatility | 42.0% |  | 39.8% |  | 35.0%
Expected dividend yield | —% |  | —% |  | —%
Risk-free interest rate | 1.97% |  | 1.16% |  | 1.81%
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, 2016 | 1,743 |  |  | $ | 20.13 |  |  | 6.2 |  | $ | — |
Issued | 239 |  |  | 15.03 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited / canceled | (3 | ) |  | 15.15 |  |  |  |  |
Outstanding balance at December 31, 2017 | 1,979 |  |  | $ | 19.52 |  |  | 5.5 |  | $ | 1,431 |
Exercisable, end of year | 1,094 |  |  | $ | 19.51 |  |  | 4.3 |  | $ | 1,329 |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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