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Bank Borrowings - Loan Facilities (Details)
1 Months Ended 36 Months Ended
Nov. 30, 2018
HKD ($)
Aug. 31, 2018
HKD ($)
agreement
Nov. 30, 2017
HKD ($)
Nov. 30, 2017
USD ($)
Mar. 31, 2017
HKD ($)
Mar. 31, 2017
USD ($)
Feb. 28, 2017
HKD ($)
agreement
Oct. 31, 2018
Dec. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
Aug. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Revolving loan facility                            
Bank Borrowings                            
Term 3 years                          
Aggregate amount of credit facilities $ 234,000,000                 $ 30,000,000        
Amount drawn from the credit facility             $ 20,000,000   $ 0     $ 0   $ 2,564,000
Line of Credit, repaid         $ 20,000,000 $ 2,564,000                
Revolving loan facility | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate 0.85%             1.25%            
Unsecured credit facility                            
Bank Borrowings                            
Aggregate amount of credit facilities   $ 507,000,000 $ 400,000,000       $ 546,000,000       $ 65,000,000   $ 51,282,000 70,000,000
Number of facility agreements entered | agreement   2         2              
Unsecured credit facility | Term loan                            
Bank Borrowings                            
Term     3 years 3 years                    
Aggregate amount of credit facilities     $ 210,000,000                   26,923,000  
Amount of upfront fee     $ 1,575,000 $ 202,000                    
Unsecured credit facility | Term loan | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate     1.50% 1.50%                    
Unsecured credit facility | Revolving loan facility                            
Bank Borrowings                            
Term     18 months 18 months                    
Aggregate amount of credit facilities     $ 190,000,000                   $ 24,359,000  
Amount drawn from the credit facility                 0     $ 0    
Unsecured credit facility | Revolving loan facility | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate     1.25% 1.25%                    
First unsecured credit facility | Term loan                            
Bank Borrowings                            
Term             18 months              
Aggregate amount of credit facilities             $ 156,000,000             20,000,000
First unsecured credit facility | Term loan | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate             1.25%              
First unsecured credit facility | Revolving loan facility                            
Bank Borrowings                            
Term   2 years         18 months              
Aggregate amount of credit facilities   $ 351,000,000         $ 195,000,000       45,000,000     25,000,000
Amount drawn from the credit facility                 0          
First unsecured credit facility | Revolving loan facility | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate   1.35%         1.25%              
Second unsecured credit facility | Term loan                            
Bank Borrowings                            
Term             18 months              
Aggregate amount of credit facilities             $ 78,000,000             10,000,000
Second unsecured credit facility | Term loan | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate             1.25%              
Second unsecured credit facility | Revolving loan facility                            
Bank Borrowings                            
Term   2 years         18 months              
Aggregate amount of credit facilities   $ 156,000,000         $ 117,000,000       $ 20,000,000     $ 15,000,000
Amount drawn from the credit facility                 $ 0          
Second unsecured credit facility | Revolving loan facility | HIBOR                            
Bank Borrowings                            
Basis spread on variable rate   1.35%         1.25%