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Fair Value - Interest Rate Cap, Convertible Series E, and Preferred Shares (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liabilities:      
Participating preferred shares derivative liability $ 29,470 $ 69,810 $ 62,790
Recurring      
Assets:      
Treasury lock 75    
Liabilities:      
Participating preferred shares derivative liability 29,470 69,810  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
Treasury lock 0    
Liabilities:      
Participating preferred shares derivative liability 0 0  
Recurring | Significant Other Observable Inputs (Level 2)      
Assets:      
Treasury lock 75    
Liabilities:      
Participating preferred shares derivative liability 0 0  
Recurring | Significant Unobservable Inputs (Level 3)      
Assets:      
Treasury lock 0    
Liabilities:      
Participating preferred shares derivative liability $ 29,470 $ 69,810