Revenues - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 332,393	$ 299,893
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Total revenues	6,497	6,805
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Total revenues	325,896	293,088
Digital Media Segment [Member]
Disaggregation of Revenue [Line Items]
Total revenues	162,691	147,683
Digital Media Segment [Member] | Advertising [Member]
Disaggregation of Revenue [Line Items]
Total revenues	115,265	105,600
Digital Media Segment [Member] | Subscription [Member]
Disaggregation of Revenue [Line Items]
Total revenues	45,428	40,378
Digital Media Segment [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,998	1,705
Cloud Services Segment [Member]
Disaggregation of Revenue [Line Items]
Total revenues	169,784	152,245
Cloud Services Segment [Member] | Subscription [Member]
Disaggregation of Revenue [Line Items]
Total revenues	169,748	151,790
Cloud Services Segment [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Total revenues	36	455
Corporate [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1	1
Intersegment Elimination [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ (83)	$ (36)