Net (Loss) Income Per Common Share (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	625,800	821,500
Average price of anti-dilutive options outstanding	$ 30.17	$ 26.97
Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	406,847	410,816
Exercise of Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	73,609	515
Issuance of Stock for Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	7,708