Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 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	3,173	3,287
Debt, net	1,214,241	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	3,173	3,287
Debt, net	1,214,241	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	3,013	3,337
Debt, net	$ 1,237,699	$ 1,087,168