| Schedule of Earnings Per Share Reconciliation [Table Text Block] |
| | Three Months Ended | | | September 30, 2013 | | September 30, 2012 | | | (amounts in thousands, except share and per share data) | | | | | | | | Net Income | | | | | | | Net Income | | | Net Income | | | | (Loss) | | Net Income | | | | (Loss) | | | (Loss) | | Shares | | Per Share | | (Loss) | | Shares | | Per Share | | | | | | | | | | | | | | | | | | | Basic net income (loss) per common share: | $ | 6,875 | | 37,385,753 | | $ | 0.18 | | $ | 8,177 | | 36,735,215 | | $ | 0.22 | | Impact of dilutive equity awards | | | | 767,669 | | | | | | | | 812,430 | | | | | | | | | | | | | | | | | | | | | | Diluted net income (loss) per common share: | $ | 6,875 | | 38,153,422 | | $ | 0.18 | | $ | 8,177 | | 37,547,645 | | $ | 0.22 |
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| | Nine Months Ended | | | September 30, 2013 | | September 30, 2012 | | | (amounts in thousands, except share and per share data) | | | | | | | | Net Income | | | | | | | Net Income | | | Net Income | | | | (Loss) | | Net Income | | | | (Loss) | | | (Loss) | | Shares | | Per Share | | (Loss) | | Shares | | Per Share | | | | | | | | | | | | | | | | | | | Basic net income (loss) per common share: | $ | 16,517 | | 37,334,620 | | $ | 0.44 | | $ | 3,921 | | 36,704,001 | | $ | 0.11 | | Impact of dilutive equity awards | | | | 874,359 | | | | | | | | 958,183 | | | | | | | | | | | | | | | | | | | | | | Diluted net income (loss) per common share: | $ | 16,517 | | 38,208,979 | | $ | 0.43 | | $ | 3,921 | | 37,662,184 | | $ | 0.10 |
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| Equity Award Impact Schedule [Table Text Block] |
| | | | Three Months Ended | | | | | September 30, | | Impact Of Equity Awards | | 2013 | | 2012 | | | | | (amounts in thousands, | | | | | except per share data) | | | | | | | | | | | | Dilutive or anti-dilutive for all potentially dilutive equivalent shares | | dilutive | | | dilutive | | | | | | | | | | | | Excluded shares as anti-dilutive under the treasury stock method: | | | | | | | | | | Options | | | 36 | | | | 49 | | | Price range of options: from | | $ | 8.79 | | | $ | 6.34 | | | Price range of options: to | | $ | 48.21 | | | $ | 48.21 | | | RSUs with service conditions | | | 6 | | | | 956 | | | RSUs with service and market conditions as market conditions not met | | | 200 | | | | 200 | | | Total RSUs | | | 206 | | | | 1,156 |
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| | | | Nine Months Ended | | | | | September 30, | | Impact Of Equity Awards | | 2013 | | | 2012 | | | | | (amounts in thousands, | | | | | except per share data) | | | | | | | | | | | | Dilutive or anti-dilutive for all potentially dilutive equivalent shares | | dilutive | | | dilutive | | | | | | | | | | | | Excluded shares as anti-dilutive under the treasury stock method: | | | | | | | | | | Options | | | 38 | | | | 51 | | | Price range of options: from | | $ | 8.79 | | | $ | 6.36 | | | Price range of options: to | | $ | 48.21 | | | $ | 48.21 | | | RSUs with service conditions | | | 242 | | | | 1,109 | | | RSUs with service and market conditions as market conditions not met | | | 200 | | | | 200 | | | Total RSUs | | | 442 | | | | 1,309 |
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