Earnings (Loss) Per Common Share (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Employee Stock Option [Member]
Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share amount	661,300	1,311,100
Warrants [Member]
Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share amount	3,000,000	4,000,000
Exercise price	$ 33.33	$ 33.33
3.875% Convertible Senior Debentures, due November 1, 2029 [Member]
Earnings Per Share [Line Items]
Convertible notes interest rate	3.875%		3.875%
3.875% Convertible Senior Debentures, due November 1, 2029 [Member] | Convertible Debt Securities [Member]
Earnings Per Share [Line Items]
Convertible notes interest rate		3.875%