Equity (Changes in Shares by Class) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Stock options exercised	0	0	430
Preferred Shares Issued [Member]
Class of Stock [Line Items]
Balance	968,000	968,000	968,000
Issuance (forfeitures) of non-vested stock, net		0	0
Restricted share unit activity	0	0	0
Stock options exercised			0
Treasury shares purchased			0
Issuance of common stock			0
Settlement of prepaid common stock purchase contracts		0	0
Balance	968,000	968,000	968,000
Common Shares Issued [Member]
Class of Stock [Line Items]
Balance	790,989,000	790,956,000	495,514,000
Issuance (forfeitures) of non-vested stock, net		(1,000)	(9,000)
Restricted share unit activity	1,284,000	19,000	44,000
Stock options exercised			1,000
Treasury shares purchased			0
Issuance of common stock			293,250,000
Settlement of prepaid common stock purchase contracts		15,000	2,156,000
Balance	792,273,000	790,989,000	790,956,000
Treasuty Shares Held [Member]
Class of Stock [Line Items]
Balance	5,693,000	5,693,000	5,686,000
Issuance (forfeitures) of non-vested stock, net		0	0
Restricted share unit activity	0	0	0
Stock options exercised			0
Treasury shares purchased			7,000
Issuance of common stock			0
Settlement of prepaid common stock purchase contracts		0	0
Balance	5,693,000	5,693,000	5,693,000