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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Real estate notes receivable	$ 28,520	$ 20,000
Tenant note receivable	3,202	3,287
Debt, net	1,125,792	1,037,359
Carrying Amount \| Fair Value Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Real estate notes receivable	28,520	20,000
Tenant note receivable	3,202	3,287
Debt, net	1,125,792	1,037,359
Fair Value \| Fair Value Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Real estate notes receivable	28,520	20,000
Tenant note receivable	3,098	3,337
Debt, net	$ 1,149,460	$ 1,087,168

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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