Discontinued Operations - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 09, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 29, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Big Fish Games	$ 970,700,000	$ 970,700,000	$ 0	$ 0
Carrying Value of Disposal Group	751,200,000
Working capital adjustments	5,200,000
Transaction expense, net	14,100,000
Gain on sale of Big Fish Games	219,500,000
Income tax provision on gain from sale of business	51,200,000
After tax gain	168,300,000
Big Fish Games
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Big Fish Games	$ 990,000,000
Big Fish Games | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction expense, net			4,700,000	5,800,000
Gain on sale of Big Fish Games			0	0
Previously recognized compensation expense					$ 0
Compensation expense recognized due to acceleration of vesting			3,400,000
Stock-based compensation expense		$ 3,400,000	11,100,000	5,600,000
Increase in fair values of Big Fish Games deferred payment and earnout liability			$ 1,100,000	$ 5,700,000