Fair Value Of Assets And Liabilities - Additional Information (Details) - USD ($)	1 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate, fair value input			2.30%
Increase in fair values of Big Fish Games deferred payment and earnout liability			$ 5,700,000	$ 21,700,000
Big Fish Games deferred payment			26,400,000	28,500,000	$ 0
Amount one-percentage point change in discount rate would increase or decrease the fair value of Big Fish Games deferred payment and earnout liability			1,000,000
Long-term debt	$ 907,500,000	$ 765,600,000	907,500,000	765,600,000
Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	600,000,000		600,000,000
Fair value of long-term debt	622,500,000	604,100,000	622,500,000	604,100,000
Big Fish Games
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Big Fish Games deferred payment	$ 28,400,000	$ 28,400,000		$ 28,400,000
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in fair values of Big Fish Games deferred payment and earnout liability			3,400,000
Big Fish Games deferred payment			(28,400,000)
Decrease in Bluff contingent consideration fair value			$ 2,300,000