Schedule III - Real Estate and Accumulated Depreciation Schedule III - Real Estate and Accumulated Depreciation (Summary) (Details) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule III - Real Estate and Accumulated Depreciation [Abstract]
SEC Schedule III, Real Estate, Gross, January 1	$ 698,536	$ 541,493	$ 698,536	$ 541,493	$ 463,197
Payments to Acquire Property, Plant, and Equipment			654,670	110,601	75,806
Property Additions Acquired With Increases in Accounts Payable			3,086	0	0
Additions Through Contingent Liabilities			1,600	0	5,478
Additions Through Assumption Of Debt	80,528	19,250	80,528	19,250	0
Property Additions Through Conveyance Of Noncontrolling Interest			0	10,964	0
Additions Through Settlement Of Mortgage Note			13,741	0	0
SEC Schedule III, Real Estate, Cost of Real Estate Sold			(30,159)	(17,259)	(2,988)
SEC Schedule III, Real Estate, Other Additions			0	39,323	0
SEC Schedule III, Real Estate, Other Deductions			0	(5,836)	0
SEC Schedule III, Real Estate, Gross, December 31			1,422,002	698,536	541,493
SEC Schedule III, Real Estate Accumulated Depreciation, January 1	163,146	146,698	163,146	146,698	135,543
SEC Schedule III, Real Estate Accumulated Depreciation, Depreciation Expense			20,658	16,981	11,992
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold			(9,542)	(6,250)	(837)
SEC Schedule III, Real Estate Accumulated Depreciation, Other Additions			0	9,942	0
SEC Schedule III, Real Estate Accumulated Depreciation, Other Deductions			0	(4,225)	0
SEC Schedule III, Real Estate Accumulated Depreciation, December 31			$ 174,262	$ 163,146	$ 146,698