Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Accounts Receivable (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Accounts receivable, gross $ 130,583 $ 102,089  
Less: Allowance for doubtful accounts (10,091) (8,640)  
Accounts receivable, net 120,492 93,449  
Allowance For Doubtful Accounts And Sales Allowance      
Allowance for Doubtful Accounts [Roll Forward]      
Beginning balance 8,640 7,468 $ 1,929
Additions charged to statements of operations 2,624 1,172 5,539
Allowance for Doubtful Accounts Receivable, Write-offs (1,173) 0 0
Ending balance $ 10,091 $ 8,640 $ 7,468