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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