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Goodwill and other intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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