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Basis of Presentation and Significant Accounting Policies (Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 04, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Summary of computation of basic and diluted net income (loss) per share |  |  |  |  |
Weighted average shares outstanding: |  | 20,886,705 | 19,886,877 | 20,805,604 | 19,741,081
Dilutive potential common shares: |  |  |  |  |
Restricted stock |  | 134,008 | 63,324 | 102,282 | 55,899
Stock options |  | 792,474 | 763,856 | 788,106 | 922,051
2019 convertible senior notes |  | 1,184,092 | 745,591 | 1,046,257 | 402,941
Shares used to compute diluted income per share |  | 22,997,279 | 21,459,648 | 22,742,249 | 21,121,972
Potentially dilutive shares excluded from calculation due to anti-dilutive effect |  | 3,540,806 | 3,343,719 | 3,522,063 | 3,803,007
Subsequent Event [Member] |  |  |  |  |
Dilutive potential common shares: |  |  |  |  |
Shares repurchased (shares) | 20,000 |  |  |  |
Share repurchased | $ 1.9 |  |  |  |

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