Schedule III - Real Estate and Accumulated Depreciation (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance	$ 1,495,167	$ 1,163,552	$ 605,382	$ 0
Acquisitions	280,927	515,531	602,075
Capital Expenditures	50,688	42,639	3,307
Balance	77,938	36,068	5,668	0
Depreciation	$ 41,870	$ 30,400	$ 5,668