Revenue - Advertising Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017
Disaggregation of Revenue [Line Items]
Advertising revenue	$ 417,346	$ 385,635	$ 1,245,854	$ 1,191,513
Display
Disaggregation of Revenue [Line Items]
Advertising revenue	100,975	98,257	312,723	325,844
Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	20,702	15,376	53,802	50,051
Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	121,677	113,633	366,525	375,895
Print | Display
Disaggregation of Revenue [Line Items]
Advertising revenue	57,245	56,710	188,853	196,836
Print | Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	6,676	7,679	22,182	24,966
Print | Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	63,921	64,389	211,035	221,802
Digital | Display
Disaggregation of Revenue [Line Items]
Advertising revenue	43,730	41,547	123,870	129,008
Digital | Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	14,026	7,697	31,620	25,085
Digital | Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	$ 57,756	$ 49,244	$ 155,490	$ 154,093