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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at January 1 | $ 6,869 | $ 1,708 | $ 1,786
Allowance for doubtful accounts | 26,860 | 14,602 | 3,314
Charge-offs | (19,155) | (9,531) | (3,316)
Effect of changes in foreign exchange rates | (60) | 90 | (76)
Balance at December 31 | $ 14,514 | $ 6,869 | $ 1,708

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