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Senior Notes, Secured, and Unsecured Indebtedness - Schedule of Maturities of Notes Payable, Senior Unsecured Facility, 5 3/4% and 8 1/2% Senior Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 1,185,684 $ 1,105,776
Senior Notes and Subordinated Amortizing Notes    
Debt Instrument [Line Items]    
2016 0  
2017 78,844  
2018 59,814  
2019 279,654  
2020 425,000  
Thereafter 350,000  
Total debt $ 1,193,312