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Accounts Receivable - Changes in Reserves for Accounts Receivable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, beginning of year $ 46,948 $ 33,387
Provision for credit losses 32,623 27,862
Other 14,083 9,556
Charge-offs (47,846) (38,232)
Recoveries of amounts previously charged-off 4,628 3,505
Currency translation 139 (284)
Balance, end of period $ 50,575 $ 35,794