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Goodwill and intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule Of Intangible Assets And Goodwill [Line Items]      
Total finite-lived intangibles, Gross carrying amount $ 73,280 $ 73,280 $ 73,280
Total finite-lived intangibles, Accumulated amortization (32,951) (25,936) (31,198)
Total 40,329 47,344 42,082
Goodwill, Gross carrying amount 157,264 157,264 157,264
Goodwill, Accumulated amortization 0 0 0
Goodwill, Net carrying amount 157,264 157,264 157,264
Total goodwill and other intangibles, Gross carrying amount 294,344 294,344 294,344
Total goodwill and other intangibles, Accumulated amortization (32,951) (25,936) (31,198)
Total goodwill and other intangibles, Net carrying amount 261,393 268,408 263,146
Trademarks      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Indefinite lived intangibles, Net carrying amount $ 63,800 $ 63,800 $ 63,800
Customer relationships – retailers      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Estimated useful life 10 years 10 years 10 years
Total finite-lived intangibles, Gross carrying amount $ 68,800 $ 68,800 $ 68,800
Total finite-lived intangibles, Accumulated amortization (28,667) (21,787) (26,947)
Total $ 40,133 $ 47,013 $ 41,853
Customer relationships – e-commerce      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Estimated useful life 3 years 3 years 3 years
Total finite-lived intangibles, Gross carrying amount $ 3,900 $ 3,900 $ 3,900
Total finite-lived intangibles, Accumulated amortization (3,883) (3,850) (3,875)
Total 17 50 25
Favorable leases, net      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Total finite-lived intangibles, Gross carrying amount 580 580 580
Total finite-lived intangibles, Accumulated amortization (401) (299) (376)
Total $ 179 $ 281 $ 204