Annual report pursuant to Section 13 and 15(d)

Debt, Net (Details 2)

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Debt, Net (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule on basis of which debt matures      
2018 $ 4,241    
2019 130,387    
2020 116,156    
2021 303,875    
2022 254,033    
Thereafter 1,033,475    
Total 1,842,167    
Net discounts and deferred financing costs 13,800    
Capitalized interest costs $ 5,200 $ 5,700 $ 7,200