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Equity - Preferred Stock Dividends (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Dividends Paid	$ 38,953	$ 39,011	$ 20,079
Dividends Unpaid	16,572	16,572	17,363
Total	55,525	55,583	37,442
8.5% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	14,078	14,078	14,079
Dividends Unpaid	8,447	8,447	8,446
Total	22,525	22,525	22,525
6.0% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	6,500	6,500	6,000
Dividends Unpaid	5,500	5,500	6,000
Total	12,000	12,000	12,000
7.0% Convertible perpetual preferred stock
Class of Stock [Line Items]
Dividends Paid	18,375	18,433	0
Dividends Unpaid	2,625	2,625	2,917
Total	$ 21,000	$ 21,058	$ 2,917