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Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jan. 31, 2017
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	$ (38,369)	$ (38,369)		$ (42,614)
Additions to asset retirement obligations liability
Additional obligations		6,054
Level 3
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	(38,369)	(38,369)		(42,614)
Additions to asset retirement obligations liability
Additional obligations		6,000	$ 16,800
Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap and foreign currency forward contracts	37,349	37,349		15,621
Liabilities associated with interest rate swap and foreign currency forward contracts	(407)	(407)		(10,861)
Interest Rate Swap Contracts \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap and foreign currency forward contracts	37,349	37,349		15,621
Liabilities associated with interest rate swap and foreign currency forward contracts	(407)	(407)		$ (10,861)
Spark ATM Systems
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	(38,400)	(38,400)			$ (34,800)
(Decrease) increase in fair value of contingent consideration liability	(500)	1,400
Foreign exchange gains and (losses)	1,200	5,600
Senior Notes 5.125 Percent Due 2022 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	246,900	246,900
Convertible Senior Notes 1.00 percent due 2020 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	278,500	278,500
Senior Notes 5.50 Percent Due 2025 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	$ 287,800	$ 287,800