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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Dividend yield | 0.00% | 0.00% | 0.00%
Offering of common stock shares | 120,000,000 | 120,000,000 |
2008 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance | 3,400,000 |  |
Common stock shares granted to outside directors | 50,000 |  |
Expiration period of stock options granted | 10 years |  |
Fair market value percent | 100.00% |  |
Options exercisable percentage | 25.00% |  |
Compensation costs prior to forfeiture | $ 5.9 |  |
Weighted average remaining recognition period | 2 years 2 months 12 days |  |
ATM Agreement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Offering of common stock shares |  | 10,000,000 |
Deferred financing costs | $ 0.1 | $ 0.1 |
Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional stock compensation expense | $ 4.7 |  |
Performance Awards vested | 0 |  |
Performance Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards expiration date | Dec. 31, 2026 |  |
Performance Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards expiration date | Dec. 31, 2022 |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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