Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details 1)

v3.8.0.1
Summary of Significant Accounting Policies (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule Of Significant Accounting Policies [Line Items]    
Revenues $ 1,293,403 $ 1,150,781
North America    
Schedule Of Significant Accounting Policies [Line Items]    
Revenues 875,179 850,671
Europe    
Schedule Of Significant Accounting Policies [Line Items]    
Revenues 31,070 26,162
Asia-Pacific    
Schedule Of Significant Accounting Policies [Line Items]    
Revenues 267,718 133,430
Other    
Schedule Of Significant Accounting Policies [Line Items]    
Revenues $ 119,436 $ 140,518