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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
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 1,121,321 $ 1,080,650
Senior Notes and Subordinated Amortizing Notes    
Debt Instrument [Line Items]    
2017 35,339  
2018 59,752  
2019 241,862  
2020 0  
2021 0  
Thereafter 800,000  
Total debt $ 1,136,953