Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jan. 31, 2014	Oct. 31, 2013	Aug. 31, 2013
Interest rate swaption
Derivatives Fair Value
Derivative notional amount						$ 150,000,000.0
Derivative fixed interest rate						2.151%
Derivative premium						$ 900,000
Interest rate swap
Derivatives Fair Value
Derivative notional amount							$ 200,000,000.0	$ 500,000,000.0
Derivative average fixed interest rate								2.151%
Basis spread on variable rate (as a percent)								1.00%
Gain (loss) on derivatives representing change in fair value of hedges	$ 5,600,000	$ 4,800,000	$ 800,000	$ 6,400,000
Derivative liability fair value	$ 14,800,000		$ 14,800,000
LNS
Derivatives Fair Value
Equity interest in derivative instrument held by Lotterie Nazionali	20.00%	20.00%	20.00%	20.00%
Other assets | Interest rate swaption
Derivatives Fair Value
Derivative asset fair value					$ 200,000
Other Current Liabilities [Member] | Interest rate swap
Derivatives Fair Value
Derivative liability fair value	$ 8,100,000		$ 8,100,000
Other long-term liabilities | Interest rate swap
Derivatives Fair Value
Derivative liability fair value	6,700,000		6,700,000		$ 9,500,000
Interest expense | Interest rate swap
Derivatives Fair Value
Derivative liability fair value	$ 1,700,000		$ 1,700,000