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Reserves for Credit Losses - Changes in Reserves for Credit Losses Related to Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Balance, beginning of period     $ 13,832 $ 13,919
Provision for credit losses $ 9,489 $ 6,635 19,849 14,532
Charge-offs     (24,825) (20,667)
Recoveries of amounts previously charged-off     4,980 3,965
Currency translation     151 (214)
Balance, end of period $ 13,987 $ 11,535 $ 13,987 $ 11,535