Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)		3 Months Ended
	Dec. 06, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allocation of purchase price to the estimated fair values of the assets acquired and liabilities assumed
Goodwill			$ 277,263,000	$ 278,337,000	$ 251,024,000
Rocket Gaming Systems [Member]
Allocation of purchase price to the estimated fair values of the assets acquired and liabilities assumed
Inventories	$ 354,000
Property and equipment	3,307,000
Goodwill	23,217,000
Intangible assets	30,290,000
Total assets	57,168,000
Other long-term liabilities	318,000
Total purchase price	$ 56,850,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 5 months
Cadillac Jack [Member]
Allocation of purchase price to the estimated fair values of the assets acquired and liabilities assumed
Property and equipment					$ 0
In Bet Gaming [Member]
Allocation of purchase price to the estimated fair values of the assets acquired and liabilities assumed
Goodwill		$ 3,200,000
Intangible assets		5,500,000
Total purchase price		$ 9,600,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years