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Equity - Preferred Stock Dividends (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Class of Stock
Dividends Paid	$ 3,315sd_PreferredDividendsPaid	$ 3,315sd_PreferredDividendsPaid
Dividends Unpaid	10,566sd_PreferredDividendsAccruedNotYetPaid	10,566sd_PreferredDividendsAccruedNotYetPaid
Total	13,881	13,881
8.5% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	2,815	2,815
Dividends Unpaid	2,816	2,816
Total	5,631	5,631
6.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	500	500
Dividends Unpaid	2,500	2,500
Total	3,000	3,000
7.0% Convertible perpetual preferred stock
Class of Stock
Dividends Paid	0	0
Dividends Unpaid	5,250	5,250
Total	$ 5,250	$ 5,250