Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Earnings (Loss) Per Share) (Details)

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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 $ (6,170) $ 23,564 $ (293) $ 24,318
Net income from discontinued operations 0 0 731 0
Net (loss) income $ (6,170) $ 23,564 $ 438 $ 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 0 52,187
Stock options 0 1,044,926 0 1,001,147
2019 convertible senior notes 0 463,232 0 231,617
Shares used to compute diluted income per share 20,831,809 21,276,404 20,765,053 20,953,134
Basic per share amounts:        
(Loss) income from continuing operations (in usd per share) $ (0.30) $ 1.19 $ (0.01) $ 1.24
Income from discontinued operations (in usd per share) 0.00 0.00 0.04 0.00
Basic net (loss) income per share (in usd per share) (0.30) 1.19 0.02 1.24
Diluted per share amounts:        
(Loss) income from continuing operations (in usd per share) (0.30) 1.11 (0.01) 1.16
Income from discontinued operations (in usd per share) 0.00 0.00 0.04 0.00
Diluted net (loss) income per share (in usd per share) $ (0.30) $ 1.11 $ 0.02 $ 1.16