Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Revenue Recognition (Up-Front Customer Loyalty Programs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 620,103	$ 580,752	$ 1,196,159	$ 1,118,408
Up front customer loyalty programs
Disaggregation of Revenue [Line Items]
Capitalized customer acquisition costs	126,400		126,400		$ 124,400
Recognized as a reduction of revenue	$ 8,800		$ 17,700