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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jan. 31, 2017
Acquisition-related contingent consideration        
Liabilities associated with acquisition-related contingent consideration $ (45,505)   $ (42,614)  
Additions to asset retirement obligations liability        
Additional obligations 1,995      
Level 3        
Acquisition-related contingent consideration        
Liabilities associated with acquisition-related contingent consideration (45,505)   (42,614)  
Additions to asset retirement obligations liability        
Additional obligations 2,000 $ 8,900    
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 30,222   15,621  
Liabilities associated with interest rate swap and foreign currency forward contracts (2,596)   (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 30,222   15,621  
Liabilities associated with interest rate swap and foreign currency forward contracts (2,596)   $ (10,861)  
Spark ATM Systems        
Acquisition-related contingent consideration        
Liabilities associated with acquisition-related contingent consideration       $ (34,800)
Loss from change in fair value of contingent consideration liability 1,000      
Loss on remeasurement of contingent consideration liability 1,900      
Senior Notes 5.125 Percent Due 2022 | Level 2 [Member]        
Long-term debt        
Fair value of long term notes 243,600      
Convertible Senior Notes 1.00 percent due 2020 | Level 2 [Member]        
Long-term debt        
Fair value of long term notes 267,700      
Senior Notes 5.50 Percent Due 2025 | Level 2 [Member]        
Long-term debt        
Fair value of long term notes $ 283,900