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Related Party Transactions (Summary of Related Party Transactions) (Details) - Axionlog Distribution B.V. [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Food and paper $ (173,387) $ (163,536) $ (164,882)
Occupancy and other operating expenses (4,281) (3,882) (2,499)
Net interest income 0 47 461
Logistics service fees from related party 48,773 40,714 44,170
Suppliers purchase expense related party $ 124,614 $ 122,822 $ 120,712