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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 09, 2011	Jun. 17, 2011	Mar. 25, 2011	Sep. 10, 2010	Jun. 18, 2010	Mar. 26, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 160,986	$ 150,168	$ 103,753	$ 132,423	$ 131,894	$ 94,148	$ 223,323	$ 180,858	$ 638,230	$ 539,323	$ 493,642
Investments							2,816,697	2,324,432	2,816,697	2,324,432	2,048,753
Chicago [Member]
Segment Reporting Information [Line Items]
Revenues									136,287	129,584	128,125
Investments							532,098	532,098	532,098	532,098	532,098
Los Angeles [Member]
Segment Reporting Information [Line Items]
Revenues									74,819	70,129	68,484
Investments							200,195	198,766	200,195	198,766	198,408
Boston [Member]
Segment Reporting Information [Line Items]
Revenues									66,564	63,396	65,517
Investments							349,447	349,447	349,447	349,447	349,447
US Virgin Islands [Member]
Segment Reporting Information [Line Items]
Revenues									34,367	48,893	48,159
Investments							126,907	93,635	126,907	93,635	82,437
New York City [Member]
Segment Reporting Information [Line Items]
Revenues									88,586	44,345	36,672
Investments							524,309	188,451	524,309	188,451	119,767
Minneapolis [Member]
Segment Reporting Information [Line Items]
Revenues									50,769	27,130	0
Investments							155,703	155,703	155,703	155,703	0
Other [Member]
Segment Reporting Information [Line Items]
Revenues									186,838	155,846	146,685
Investments							$ 928,038	$ 806,332	$ 928,038	$ 806,332	$ 766,596