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