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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
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 1,302,347 $ 1,030,184
Senior Notes and Subordinated Amortizing Notes    
Debt Instrument [Line Items]    
Remaining in 2018 21,352  
2019 113,979  
2020 0  
2021 36,915  
2022 350,000  
Thereafter 800,000  
Total debt $ 1,322,246