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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, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 1,167,170 $ 1,105,776
Senior Notes and Subordinated Amortizing Notes    
Debt Instrument [Line Items]    
2016 16,636  
2017 149,683  
2018 44,327  
2019 189,436  
2020 425,000  
Thereafter 350,000  
Total debt $ 1,175,082