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Equity - Preferred Stock Dividends (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Class of Stock
Dividends Paid	$ 2,625	$ 2,625	$ 11,191	$ 11,191
Dividends Unpaid	11,256	11,256	16,572	16,572
Total	13,881	13,881	27,763	27,763
8.5% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	0	0	2,816	2,816
Dividends Unpaid	5,631	5,631	8,447	8,447
Total	5,631	5,631	11,263	11,263
6.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	0	0	500	500
Dividends Unpaid	3,000	3,000	5,500	5,500
Total	3,000	3,000	6,000	6,000
7.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	2,625	2,625	7,875	7,875
Dividends Unpaid	2,625	2,625	2,625	2,625
Total	$ 5,250	$ 5,250	$ 10,500	$ 10,500