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Schedule IV - Mortgage Loans on Real Estate Schedule IV - Mortgage Loans on Real Estate (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]          
Mortgage Loans on Real Estate Principal Repayments and Reductions   $ 0 $ 1,900 $ 5,605  
Purchase Price     190,100    
Cash Consideration     156,400    
Iowa [Member] | Other Property [Member] | Other Mortgage Loans [Member]          
Mortgage Loans on Real Estate [Line Items]          
Face Amount         $ 40,000
Interest Rate   7.70%      
Incremental Interest Rate for Default   3.00%      
Mortgage Loan on Real Estate Exit Fee   $ 1,500      
Real estate acquisitions [Member]          
Mortgage Loans on Real Estate [Line Items]          
Purchase Price   241,900 187,200    
Cash Consideration   $ 224,900 $ 153,500    
Real estate acquisitions [Member] | Oklahoma [Member] | Construction Loans [Member]          
Mortgage Loans on Real Estate [Line Items]          
Purchase Price $ 85,400        
Face Amount 81,200        
Cash Consideration $ 4,100