Fair Value Measurements - Derivatives (Details)	12 Months Ended				12 Months Ended
	Dec. 31, 2014 Lotterie Nazionali S.r.l. USD ($)	Dec. 31, 2013 Lotterie Nazionali S.r.l. USD ($)	Jan. 31, 2014 LIBOR swaption USD ($)	Dec. 31, 2014 LIBOR swaption Other assets USD ($)	Dec. 31, 2014 Interest rate swap USD ($)	Dec. 31, 2013 Interest rate swap USD ($)	Oct. 31, 2013 Interest rate swap USD ($)	Aug. 31, 2013 Interest rate swap USD ($)	Dec. 31, 2013 Interest rate swap Other assets USD ($)	Dec. 31, 2014 Interest rate swap Other long-term liabilities USD ($)	Dec. 31, 2013 Interest rate swap Other long-term liabilities USD ($)	May 31, 2013 Foreign currency forward contracts EUR (€)	Dec. 31, 2012 Foreign currency forward contracts	Aug. 31, 2013 LIBOR Interest rate swap
Derivatives Fair Value
Notional amounts of the forward contracts			$ 150,000,000.0				$ 200,000,000	$ 500,000,000				€ 20,000,000
Derivative, fixed interest rate			2.151%
Derivative, premium			900,000
Derivative asset, fair value				200,000					400,000
Derivative, average fixed interest rate								2.151%
Variable interest rate														1.00%
Loss recognized in other comprehensive income (loss)	500,000	100,000			5,000,000	1,000,000
Derivative liability, fair value										$ 9,500,000	$ 1,900,000
Weighted-average fixed rate of forward exchange contract												1.269%	131.90%
Equity interest in derivative instrument held by Lotterie Nazionali	20.00%