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Equity - Preferred Stock Dividends (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Dividends Paid	$ 38,953sd_PreferredDividendsPaid	$ 38,953sd_PreferredDividendsPaid	$ 39,011sd_PreferredDividendsPaid
Dividends Unpaid	16,572sd_PreferredDividendsAccruedNotYetPaid	16,572sd_PreferredDividendsAccruedNotYetPaid	16,572sd_PreferredDividendsAccruedNotYetPaid
Total	55,525	55,525	55,583
8.5% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	14,078	14,078	14,078
Dividends Unpaid	8,447	8,447	8,447
Total	22,525	22,525	22,525
6.0% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	6,500	6,500	6,500
Dividends Unpaid	5,500	5,500	5,500
Total	12,000	12,000	12,000
7.0% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	18,375	18,375	18,433
Dividends Unpaid	2,625	2,625	2,625
Total	$ 21,000	$ 21,000	$ 21,058