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Investment in Direct Financing Lease (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investment in Direct Financing Lease    
Percentage of term exceeding useful life of one office tower 75.00%  
Total minimum lease payments receivable $ 37,158 $ 39,182
Estimated unguaranteed residual value of leased asset 4,951 4,951
Unearned income (10,361) (10,754)
Net investment in direct financing lease $ 31,748 $ 33,379