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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, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 1,375,506 $ 1,321,345
Senior Notes and Subordinated Amortizing Notes    
Debt Instrument [Line Items]    
Remaining in 2019 15,217  
2019 36,409  
2020 203,605  
2021 350,000  
2022 350,000  
Thereafter 436,886  
Total debt $ 1,392,117