Equity - Preferred Stock Dividends (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Class of Stock
Dividends Paid	$ 3,315	$ 3,315	$ 28,453	$ 28,453
Dividends Unpaid	8,066	10,566	10,691	13,191
Total	11,381	13,881	39,144	41,644
8.5% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	2,815	2,815	14,078	14,078
Dividends Unpaid	2,816	2,816	2,816	2,816
Total	5,631	5,631	16,894	16,894
6.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	500	500	6,500	6,500
Dividends Unpaid	0	2,500	0	2,500
Total	500	3,000	6,500	9,000
7.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	0	0	7,875	7,875
Dividends Unpaid	5,250	5,250	7,875	7,875
Total	$ 5,250	$ 5,250	$ 15,750	$ 15,750