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General and Basis of Presentation - Cash, Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents
Cash and cash equivalents	$ 40,428	$ 51,370	$ 61,498
Current and long-term restricted cash	73,985		43,763
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total	114,413	99,817	$ 105,261	$ 105,747
Inventory, Net [Abstract]
Inventory, Gross	15,490	16,116
Less: Inventory reserves	(173)	(1,833)
Inventory, net, Total	15,317	14,283
ATMs
Inventory, Net [Abstract]
Inventory, Gross	2,245	3,181
ATM Parts And Supplies
Inventory, Net [Abstract]
Inventory, Gross	$ 13,245	$ 12,935