Acquisitions - Other Acquisitions (Details) $ in Thousands	Jan. 31, 2017 USD ($) item	Sep. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Other Acquisitions
Number of ATMs operated by entity | item		230,000
Purchase consideration	$ 19,500
Maximum contingent consideration	$ 56,700
Acquisition-related contingent consideration		$ 38,369	$ 42,614
Estimated fair values of the assets acquired and liabilities assumed
Goodwill		759,191	$ 774,939
Spark ATM Systems
Other Acquisitions
Number of ATMs operated by entity | item	2,300
Acquisition-related contingent consideration	$ 34,800	$ 38,400
Estimated fair values of the assets acquired and liabilities assumed
Property and equipment	5,300
Intangible assets	2,800
Asset retirement obligations	400
Other long-term liabilities	1,500
Goodwill	$ 48,200