Acquisition - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
	Dec. 27, 2018	Mar. 31, 2019	[1]	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Deferred payments for acquisitions in previous years		$ 0		$ 3,875
Investments in other businesses					$ 4,200
Repayments of notes payable					1,600
Online Gift Card Solution
Business Acquisition [Line Items]
Aggregate purchase price	$ 17,000
Cash acquired from acquisition	$ 11,000
Deferred payments for acquisitions in previous years					$ 3,900

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, "Statement of Cash Flows (Topic 230)", which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.