Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenues by destination (Details 2)

v3.10.0.1
Summary of Significant Accounting Policies - Revenues by destination (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenues by destination $ 1,381,193 $ 1,858,356 $ 1,522,174 $ 1,293,403 $ 1,249,553 $ 1,651,738 $ 1,344,103 $ 1,150,781 $ 6,055,126 $ 5,396,175 $ 4,874,340
North America                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenues by destination                 3,543,282 3,285,903 3,132,208
Europe                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenues by destination                 1,462,698 1,347,381 1,148,403
Asia-Pacific                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenues by destination                 721,404 394,631 196,978
Other                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenues by destination                 $ 327,742 $ 368,260 $ 396,751