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Commitments and Contingencies (Details Textual)
$ in Millions, $ in Millions
9 Months Ended 12 Months Ended
Feb. 12, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
renewal
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
AUD ($)
Commitments and Contingencies [Line Items]            
Operating agreements, number of renewal options | renewal     2      
Operating agreements, renewal option, term     5 years      
Minimum rent expense     $ 49.9 $ 45.4 $ 38.2  
Estimated construction capital project cost   $ 255.3        
Cost already spent on existing capital projects   210.8        
Remaining capital required for capital projects   $ 44.5        
Estimate of possible loss     $ 19.6      
Workforce Subject to Collective Bargaining Arrangements            
Commitments and Contingencies [Line Items]            
Concentration risk, percentage     32.00%      
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year            
Commitments and Contingencies [Line Items]            
Concentration risk, percentage     9.00%      
National Australia Bank Limited | Ravenhall | Non Recourse Debt            
Commitments and Contingencies [Line Items]            
Capital contribution     $ 81.1     $ 115
Construction Facility | National Australia Bank Limited | Ravenhall | Non Recourse Debt            
Commitments and Contingencies [Line Items]            
Maximum borrowing capacity     $ 558.1     $ 791
Senior Officer Employment Agreement | Senior Vice President            
Commitments and Contingencies [Line Items]            
Initial term of contract 2 years          
Additional term of contract 2 years          
Continuous rolling extension period until maximum age (67 years) reached 1 day          
Maximum age for contract termination 67 years          
Officers' compensation $ 0.4