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Revenue Recognition - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Beginning balance $ 3,809 $ 3,700 $ 4,447 $ 5,728
Increase (decrease) in the provision for credit losses 311 54 (284) 791
Write-off of uncollectible amounts, net of recoveries (445) (147) (488) (2,912)
Ending balance $ 3,675 $ 3,607 $ 3,675 $ 3,607