Segment and Related Information - Reconciliation of Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Identifiable assets by geographic area [Abstract]
Assets	$ 338,675	$ 343,749
Long-Lived Assets	262,386	266,845
Goodwill by business segment [Abstract]
Goodwill	41,214	41,214
United States
Identifiable assets by geographic area [Abstract]
Long-Lived Assets	247,937	250,275
Other Countries
Identifiable assets by geographic area [Abstract]
Long-Lived Assets	14,449	16,570
Restaurant and Retail
Goodwill by business segment [Abstract]
Goodwill	40,478	40,478
Government Segment
Goodwill by business segment [Abstract]
Goodwill	736	736
Operating segments | Restaurant and Retail
Identifiable assets by geographic area [Abstract]
Assets	141,330	140,606
Operating segments | Government Segment
Identifiable assets by geographic area [Abstract]
Assets	13,165	13,150
Corporate, Non-Segment
Identifiable assets by geographic area [Abstract]
Assets	$ 184,180	$ 189,993