Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies (Earnings (Loss) Per Share) (Details)

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Basis of Presentation and Summary of Significant Accounting Policies (Earnings (Loss) Per Share) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Summary of computation of basic and diluted net income (loss) per share        
Weighted average shares outstanding: 21,012,611 20,831,809 20,974,738 20,765,053
Dilutive potential common shares:        
Restricted stock 156,054 0 170,900 0
Stock options 967,533 0 961,021 0
2019 convertible senior notes 1,079,702 0 1,010,505 0
Shares used to compute diluted income per share 23,215,900 20,831,809 23,117,164 20,765,053
Potentially dilutive shares excluded from calculation due to anti-dilutive effect 3,811,813 0 3,761,440 0