Common and Preferred Stock and Equity of TRG (Details) (USD $)	12 Months Ended									12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Series B Preferred Stock [Member]	Dec. 31, 2011 Series B Preferred Stock [Member]	Dec. 31, 2010 Series B Preferred Stock [Member]	Dec. 31, 2012 Series G Preferred Stock [Member]	Sep. 30, 2012 Series G Preferred Stock [Member]	Dec. 31, 2011 Series G Preferred Stock [Member]	Dec. 31, 2012 Series H Preferred Stock [Member]	Sep. 30, 2012 Series H Preferred Stock [Member]	Dec. 31, 2011 Series H Preferred Stock [Member]	Dec. 31, 2012 Series J Preferred Stock [Member]	Dec. 31, 2012 Series F Preferred Stock [Member]	Dec. 31, 2010 Series F Preferred Stock [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock Issued During Period, Shares, New Issues	2,875,000	2,012,500
Issuance of common stock, net of offering costs	$ 208,939,000	$ 111,956,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Conversion of Stock, Shares Converted				1,132,359	1,092,690	126,109
Conversion of Stock, Numver of shares of Common Stock converted from Series B Preferred Stock under Continuing Offer	65	76	7
Preferred Stock, Dividend Rate, Percentage							8.00%			7.625%			6.50%		8.20%
Preferred Stock, Redemption Price Per Share							$ 25.35			$ 25.33359375			$ 25
Preferred Stock, shares outstanding				25,327,699	26,461,958				4,000,000			3,480,000	7,700,000
Preferred Stock, Liquidation Preference, Value								100,000,000	100,000,000		87,000,000	87,000,000	192,500,000		30,000,000
Preferred Stock, Redemption Charge							3,300,000			3,100,000
Preferred Stock Issued During Period, Value, New Issues	186,215,000												186,200,000
Preferred Stock Issued During Period, Shares, New Issues													7,700,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs													6,300,000
Preferred Stock, liquidation value per share				$ 0.001	$ 0.001								$ 25
Preferred Stock, Redeemed Amount														27,000,000
Redemption amount, discount from book value														$ 2,200,000