Description of business, basis of presentation and summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Disaggregation of Revenue

Revenue earned by categories in 2020, 2019 and 2018 are shown below (amounts in thousands):

	Year ended Dec. 31,
	2020		2019		2018
Subscription	$	1,286,611	$	1,005,030	$	840,838
Advertising & Marketing Services	1,174,774		1,226,607		1,106,754
Political	445,535		38,478		233,613
Other	30,860		29,382		26,077
Total revenues	$	2,937,780	$	2,299,497	$	2,207,282