Receivables and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Receivables and Other Assets [Abstract]
Rents and fees receivable	$ 5,241	$ 3,915
Allowance for doubtful accounts	(2,694)	(1,606)
Straight-line rent receivable	44,006	34,205
Other receivables	12,253	2,755
Lease costs (net of accumulated amortization of $36,171 and $28,049, respectively)	86,479	62,978
Loan costs (net of accumulated amortization of $5,990 and $4,067, respectively)	7,624	7,183
Escrow and other deposits	13,701	7,606
Prepaid items	5,255	3,612
Investments in related party	3,500	3,500
Interest rate swap agreements	2,021	0
Other assets	1,048	543
Rents receivable and other assets	178,434	124,691
Accumulated amortization of deferred finance costs	5,990	4,067
Accumulated amortization of deferred leasing costs	$ 36,171	$ 28,049