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Significant Accounting Policies (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Summary of computation of basic and diluted net income (loss) per share |  |
Net income from continuing operations | $ 5,877 | $ (89)
Net income from discontinued operations | 731 | 0
Net income: | $ 6,608 | $ 754
Shares used to compute basic income per share | 20,707,926 | 19,611,881
Dilutive potential common shares: |  |
Restricted stock | 66,736 | 61,538
Stock options | 759,581 | 957,369
0.75% Convertible Senior Notes, Due 2019 | 749,736 | 0
Shares used to compute diluted income per share | 22,283,979 | 20,630,788
Basic per share amounts: |  |
Income from continuing operations (in usd per share) | $ 0.28 | $ 0.04
Income from discontinued operations (in usd per share) | 0.04 | 0.00
Net income (in usd per share) | 0.32 | 0.04
Diluted per share amounts: |  |
Income from continuing operations (in usd per share) | 0.26 | 0.04
Income from discontinued operations (in usd per share) | 0.03 | 0.00
Net income (in usd per share) | $ 0.30 | $ 0.04

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