Quarterly report pursuant to Section 13 or 15(d)

Schedule of Related Party Transactions, by Related Party (Details)

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Schedule of Related Party Transactions, by Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Related Party Transaction [Line Items]        
Gross Asset Management Costs, before Reduction $ 12,617 $ 12,258 $ 38,024 $ 36,559
Management Fee, Percent     1.50%  
Costs and Expenses, Related Party 5,920 4,297 $ 16,050 11,462
Allocated Share-based Compensation Expense $ 1,748 $ 2,031 $ 7,367 $ 8,877