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Significant Accounting Policies (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Summary of computation of basic and diluted net income (loss) per share |  |  |  |
Net (loss) income from continuing operations | $ (5,763) | $ 23,564 | $ 114 | $ 24,318
Net income from discontinued operations | 0 | 0 | 731 | 0
Net (loss) income | $ (5,763) | $ 23,564 | $ 845 | $ 24,318
Shares used to compute basic income per share | 20,831,809 | 19,725,410 | 20,765,053 | 19,668,183
Dilutive potential common shares: |  |  |  |
Restricted stock | 0 | 42,836 | 86,419 | 52,187
Stock options | 0 | 1,044,926 | 785,921 | 1,001,147
2019 convertible senior notes | 0 | 463,232 | 977,339 | 231,617
Shares used to compute diluted income per share | 20,831,809 | 21,276,404 | 22,614,732 | 20,953,134
Basic per share amounts: |  |  |  |
(Loss) income from continuing operations (in usd per share) | $ (0.28) | $ 1.19 | $ 0.01 | $ 1.24
Income from discontinued operations (in usd per share) | 0.00 | 0.00 | 0.03 | 0.00
Basic net (loss) income per share (in usd per share) | (0.28) | 1.19 | 0.04 | 1.24
Diluted per share amounts: |  |  |  |
(Loss) income from continuing operations (in usd per share) | (0.28) | 1.11 | 0.01 | 1.16
Income from discontinued operations (in usd per share) | 0.00 | 0.00 | 0.03 | 0.00
Diluted net (loss) income per share (in usd per share) | $ (0.28) | $ 1.11 | $ 0.04 | $ 1.16

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