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Fair Value - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Liabilities:        
Participating preferred shares/units derivative liability $ 28,258 $ 29,470 $ 75,220 $ 69,810
Recurring        
Assets:        
Derivative asset   75    
Liabilities:        
Participating preferred shares/units derivative liability 28,258 29,470    
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Assets:        
Derivative asset   0    
Liabilities:        
Participating preferred shares/units derivative liability 0 0    
Recurring | Significant Other Observable Inputs (Level 2)        
Assets:        
Derivative asset   75    
Liabilities:        
Participating preferred shares/units derivative liability 0 0    
Recurring | Significant Unobservable Inputs (Level 3)        
Assets:        
Derivative asset   0    
Liabilities:        
Participating preferred shares/units derivative liability $ 28,258 $ 29,470