Earnings Per Share (Details Textual) (USD $)	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Convertible Senior Notes Due Two Zero Three Six [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	2.25%	2.25%
Dividend Threshold for Adjustment to Conversion Price	$ 0.14
2.25% Purchased Options [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	2.25%
2.25% Warrants [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	2.25%
3.00% Notes [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	3.00%
3.00% Warrants [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	3.00%
3.00% Purchased Options [Member]
Earnings Per Share (Textual) [Abstract]
Debt interest rate	3.00%