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Goodwill and other intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Intangible Assets And Goodwill [Line Items]    
Finite-lived intangibles, Gross carrying amount $ 72,700 $ 73,280
Finite-lived intangibles, Accumulated amortization (37,727) (31,198)
Finite-lived intangibles, Net carrying amount 34,973 42,082
Goodwill, Gross carrying amount 157,264 157,264
Goodwill, Accumulated amortization 0 0
Goodwill, Net carrying amount 157,264 157,264
Goodwill and other intangibles, Gross carrying amount 293,764 294,344
Goodwill and other intangibles, Accumulated amortization (37,727) (31,198)
Goodwill and other intangibles, Net carrying amount 256,037 263,146
Trademarks    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Indefinite lived intangibles, Net carrying amount 63,800 63,800
Customer relationships – retailers    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Finite-lived intangibles, Gross carrying amount 68,800 68,800
Finite-lived intangibles, Accumulated amortization (33,827) (26,947)
Finite-lived intangibles, Net carrying amount $ 34,973 $ 41,853
Finite-lived intangibles, estimated useful life 10 years 10 years
Customer relationships – e-commerce    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Finite-lived intangibles, Gross carrying amount $ 3,900 $ 3,900
Finite-lived intangibles, Accumulated amortization (3,900) (3,875)
Finite-lived intangibles, Net carrying amount $ 0 $ 25
Finite-lived intangibles, estimated useful life 3 years 3 years
Favorable leases, net    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Finite-lived intangibles, Gross carrying amount   $ 580
Finite-lived intangibles, Accumulated amortization   (376)
Finite-lived intangibles, Net carrying amount   $ 204