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Segments (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Schedule of Company's Segment Results
The Company’s segment results are as follows for the three month periods ended March 31 (in thousands): 
 
 
Three Months Ended
March 31,
 
 
2018
 
2017
Revenues, net:
 
 
 
 
North America
 
$
364,270

 
$
329,948

International
 
221,230

 
190,485

 
 
$
585,500


$
520,433

Operating income:
 
 
 
 
North America
 
$
155,950

 
$
120,972

International
 
104,137

 
74,096

 
 
$
260,087


$
195,068

Depreciation and amortization:
 
 
 
 
North America
 
$
38,675

 
$
33,177

International
 
32,827

 
31,689

 
 
$
71,502


$
64,866

Capital expenditures:
 
 
 
 
North America
 
$
8,411

 
$
9,632

International
 
6,803

 
5,164

 
 
$
15,214


$
14,796