| **Net Loss Per Share (Tables)**                                                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Net Loss Per Share [Abstract]**                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Calculation of net loss per share, basic and diluted                                           |   Net Loss (Numerator)  Weighted Average Common Shares (Denominator)(in thousands)  Per Share Amount Three months ended June 30, 2014      Basic and diluted $(11,073)  63,743  $(0.17)Six months ended June 30, 2014            Basic and diluted $(20,386)  66,775  $(0.31)Three months ended June 30, 2013            Basic and diluted $(12,263)  51,481  $(0.24)Six months ended June 30, 2013            Basic and diluted $(23,521)  50,802  $(0.46) |
| Schedule of antidilutive common shares excluded from computation of diluted earnings per share | For these periods, anti-dilutive common shares excluded from diluted per share amounts consist of the following:  Three Months Ended June 30,  2014  2013  WeightedAverage Number(in thousands)  WeightedAverage Exercise Price  WeightedAverage Number(in thousands)  WeightedAverage Exercise PriceOptions  6,261  $10.14   6,340  $11.62  Six Months Ended June 30,  2014  2013  WeightedAverage Number(in thousands)  WeightedAverage Exercise Price  WeightedAverage Number(in thousands)  WeightedAverage Exercise PriceOptions  6,066  $10.43   6,036  $11.97           |

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| - Definition
Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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| - Definition
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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