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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Gain on foreign exchange $ (483) $ (460) $ (722) $ (247)
Purchases of store real property     $ 31,894 $ 8,720