Earnings (Loss) Per Common Share (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Warrants [Member]
Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share amount	4,000,000	4,000,000
Exercise price	$ 33.33	$ 33.33
Employee Stock Option [Member]
Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share amount	1,311,000	773,000
3.75% Convertible Senior Subordinated Notes Due April 15, 2014 [Member]
Earnings Per Share [Line Items]
Convertible notes interest rate		3.75%
3.875% Convertible Senior Debentures, due November 1, 2029 [Member]
Earnings Per Share [Line Items]
Convertible notes interest rate	3.875%		3.875%