SHAREHOLDERS' EQUITY (DETAILS 2) (USD $) In Thousands, except Share data, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Common Shares [Member]	Dec. 31, 2011 Series A 7.25% Preferred Shares [Member]	Dec. 31, 2011 Series B 7.5% Preferred Shares [Member]
Class of Stock [Line Items]
Authorized common shares			800,000,000
Common stock par value			$ 0.0125
Preferred shares, value issued	$ 500,000	$ 500,000		$ 250,000	$ 250,000
Preferred shares, dividend rate				7.25%	7.50%
Preferred shares, par value				$ 0.0125
Liquidation preference, per share				$ 25.00	$ 100.00
Redemption price, per share				$ 25.00	$ 100.00
Preferred dividends declared, per share				$ 1.8125	$ 7.50
Preferred dividends paid, per share				$ 1.8125	$ 7.50
Series B floating rate base					3.4525%