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Revenue Recognition - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 5,610 $ 4,447
Provision for credit losses (123) (595)
Write-off of uncollectible amounts, net of recoveries (13) (43)
Ending balance $ 5,474 $ 3,809
Warranty policy term 2 years