Acquisitions And New Ventures (Details) (USD $)	12 Months Ended			0 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 16, 2014	Dec. 31, 2014	Dec. 31, 2013	Jul. 17, 2013 sqft	May 13, 2014
Business Acquisition [Line Items]
Estimated Payable to the acquisition equity holders, income tax refund	$ 18,087,000	$ 0			$ 18,087,000	$ 0
Acquisition related charges	6,367,000	0	0
Revenues	0	0	0
Payments to Acquire Businesses, Net of Cash Acquired	366,045,000	154,872,000	142,915,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	76,518,000	85,506,000	91,227,000
Earnout liability for acquisition of Big Fish Games	324,747,000	0	0
Deferred payment for acquisition of Big Fish Games	97,073,000	0	0
Equity Method Investment, Ownership Percentage	50.00%				50.00%
Equity in gains (losses) of unconsolidated investments	6,328,000	(4,142,000)	(1,701,000)
Payments to Acquire Interest in Joint Venture	17,906,000	70,500,000	19,850,000
Big Fish Games [Member]
Business Acquisition [Line Items]
Future Business Acquisition, Cost Of Acquired Entity, Purchase Price				838,300,000
Future Business Acquisition, Cost Of Acquired Entity, Cash paid				401,700,000
Deferred Payment-Founder				85,300,000
Deferred Founders Payment,Time Payable					3 years
Deferred Payment-Founder, Fair Value				78,000,000
Estimated Payable to the acquisition equity holders, income tax refund				18,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				34,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue				37,250,000
Other intangible assets				362,863,000
Revenues					13,900,000
Payments to Acquire Businesses, Net of Cash Acquired	366,000,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest					2,900,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares					157,115
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				350,000,000
Business Combination, Contingent Consideration, Liability				324,700,000
Oxford Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents							13,700,000
Other intangible assets							64,693,000
Purchase price of the entity to be acquired							168,600,000
Square footage of Casino							25,000
Revenues	76,500,000					34,400,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	14,000,000					6,100,000
Furniture and fixtures | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						6 years
Buildings | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						40 years
Building Improvements [Member] | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						14 years
Minimum | Computer Equipment and Software [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				1 year
Minimum | Equipment
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Minimum | Equipment | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				2 years
Minimum | Equipment | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						2 years
Minimum | Furniture and fixtures
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Minimum | Furniture and fixtures | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				2 years
Minimum | Leasehold Improvements [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				3 years
Minimum | Buildings
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Computer Equipment [Member] | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						2 years
Maximum | Computer Equipment and Software [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				5 years
Maximum | Equipment
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum | Equipment | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				10 years
Maximum | Equipment | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						9 years
Maximum | Furniture and fixtures
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum | Furniture and fixtures | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				10 years
Maximum | Leasehold Improvements [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				10 years
Maximum | Buildings
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum | Computer Equipment [Member] | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life						5 years
New York Joint Venture [Member]
Business Acquisition [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	(1,600,000)
Equity Method Investment, Ownership Percentage								50.00%
Equity in gains (losses) of unconsolidated investments	(1,000,000)
Payments to Acquire Interest in Joint Venture	3,300,000
Secured Debt [Member]
Business Acquisition [Line Items]
Other Loans Payable, Long-term, Noncurrent	200,000,000	0			200,000,000	0
Issuance Of Common Stock For Extinguishment Of Convertible Note Payable [Member]
Business Acquisition [Line Items]
Issuance of common stock for acquisition of Big Fish Games	15,793,000	0	0
Trademarks
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate					0.00%
Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate					0.00%
Customer Relationships [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Other intangible assets				32,663,000
Customer Relationships [Member] | Oxford Acquisition [Member]
Business Acquisition [Line Items]
Other intangible assets							1,700,000
Developed Technology Rights [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate					0.00%
In Process Research and Development [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Discount Rate					0.00%
In Process Research and Development [Member] | Big Fish Games [Member]
Business Acquisition [Line Items]
Other intangible assets				$ 12,700,000